diff --git a/unitree_sdk2py/__init__.py b/unitree_sdk2py/__init__.py
index a951f2d..f071aeb 100644
--- a/unitree_sdk2py/__init__.py
+++ b/unitree_sdk2py/__init__.py
@@ -1,4 +1,4 @@
-from . import idl, utils, core, rpc, go2
+from . import idl, utils, core, rpc, go2, b2
 
 __all__ = [
     "idl"
@@ -6,4 +6,5 @@ __all__ = [
     "core",
     "rpc",
     "go2",
+    "b2",
 ]
diff --git a/unitree_sdk2py/b2/robot_state/robot_state_api.py b/unitree_sdk2py/b2/robot_state/robot_state_api.py
new file mode 100644
index 0000000..fde54df
--- /dev/null
+++ b/unitree_sdk2py/b2/robot_state/robot_state_api.py
@@ -0,0 +1,25 @@
+"""
+" service name
+"""
+ROBOT_STATE_SERVICE_NAME = "robot_state"
+
+
+"""
+" service api version
+"""
+ROBOT_STATE_API_VERSION = "1.0.0.1"
+
+
+"""
+" api id
+"""
+ROBOT_STATE_API_ID_SERVICE_SWITCH = 1001
+ROBOT_STATE_API_ID_REPORT_FREQ = 1002
+ROBOT_STATE_API_ID_SERVICE_LIST = 1003
+
+
+"""
+" error code
+"""
+ROBOT_STATE_ERR_SERVICE_SWITCH = 5201
+ROBOT_STATE_ERR_SERVICE_PROTECTED = 5202
diff --git a/unitree_sdk2py/b2/robot_state/robot_state_client.py b/unitree_sdk2py/b2/robot_state/robot_state_client.py
new file mode 100644
index 0000000..5b2e74d
--- /dev/null
+++ b/unitree_sdk2py/b2/robot_state/robot_state_client.py
@@ -0,0 +1,84 @@
+import json
+
+from ...rpc.client import Client
+from ...rpc.client_internal import *
+from .robot_state_api import *
+
+
+"""
+" class ServiceState
+"""
+class ServiceState:
+    def __init__(self, name: str = None, status: int = None, protect: bool = None):
+        self.name = name
+        self.status = status
+        self.protect = protect
+
+"""
+" class RobotStateClient
+"""
+class RobotStateClient(Client):
+    def __init__(self):
+        super().__init__(ROBOT_STATE_SERVICE_NAME, False)
+
+    def Init(self):
+        # set api version
+        self._SetApiVerson(ROBOT_STATE_API_VERSION)
+        # regist api
+        self._RegistApi(ROBOT_STATE_API_ID_SERVICE_SWITCH, 0)
+        self._RegistApi(ROBOT_STATE_API_ID_REPORT_FREQ, 0)
+        self._RegistApi(ROBOT_STATE_API_ID_SERVICE_LIST, 0)
+
+    def ServiceList(self):
+        p = {}
+        parameter = json.dumps(p)
+
+        code, data = self._Call(ROBOT_STATE_API_ID_SERVICE_LIST, parameter)
+
+        if code != 0:
+            return code, None
+
+        lst = []
+
+        d = json.loads(data)
+        for t in d:
+            s = ServiceState()
+            s.name = t["name"]
+            s.status = t["status"]
+            s.protect = t["protect"]
+            lst.append(s)
+            
+        return code, lst
+            
+
+    def ServiceSwitch(self, name: str, switch: bool):
+        p = {}
+        p["name"] = name
+        p["switch"] = int(switch)
+        parameter = json.dumps(p)
+        
+        code, data = self._Call(ROBOT_STATE_API_ID_SERVICE_SWITCH, parameter)
+        
+        if code != 0:
+            return code
+      
+        d = json.loads(data)
+
+        status = d["status"]
+    
+        if status == 5:
+            return ROBOT_STATE_ERR_SERVICE_PROTECTED
+
+        if status != 0 and status != 1:
+            return ROBOT_STATE_ERR_SERVICE_SWITCH
+        
+        return code
+
+    def SetReportFreq(self, interval: int, duration: int):
+        p = {}
+        p["interval"] = interval
+        p["duration"] = duration
+        parameter = json.dumps(p)
+        
+        code, data = self._Call(ROBOT_STATE_API_ID_REPORT_FREQ, p)
+        return code
diff --git a/unitree_sdk2py/b2/sport/sport_api.py b/unitree_sdk2py/b2/sport/sport_api.py
new file mode 100644
index 0000000..72520b6
--- /dev/null
+++ b/unitree_sdk2py/b2/sport/sport_api.py
@@ -0,0 +1,58 @@
+"""
+" service name
+"""
+SPORT_SERVICE_NAME = "sport"
+
+
+"""
+" service api version
+"""
+SPORT_API_VERSION = "1.0.0.1"
+
+
+"""
+" api id
+"""
+SPORT_API_ID_DAMP              = 1001;
+SPORT_API_ID_BALANCESTAND      = 1002;
+SPORT_API_ID_STOPMOVE          = 1003;
+SPORT_API_ID_STANDUP           = 1004;
+SPORT_API_ID_STANDDOWN         = 1005;
+SPORT_API_ID_RECOVERYSTAND     = 1006;
+SPORT_API_ID_EULER             = 1007;
+SPORT_API_ID_MOVE              = 1008;
+SPORT_API_ID_SIT               = 1009;
+SPORT_API_ID_RISESIT           = 1010;
+SPORT_API_ID_SWITCHGAIT        = 1011;
+SPORT_API_ID_TRIGGER           = 1012;
+SPORT_API_ID_BODYHEIGHT        = 1013;
+SPORT_API_ID_FOOTRAISEHEIGHT   = 1014;
+SPORT_API_ID_SPEEDLEVEL        = 1015;
+SPORT_API_ID_HELLO             = 1016;
+SPORT_API_ID_STRETCH           = 1017;
+SPORT_API_ID_TRAJECTORYFOLLOW  = 1018;
+SPORT_API_ID_CONTINUOUSGAIT    = 1019;
+SPORT_API_ID_CONTENT           = 1020;
+SPORT_API_ID_WALLOW            = 1021;
+SPORT_API_ID_DANCE1            = 1022;
+SPORT_API_ID_DANCE2            = 1023;
+SPORT_API_ID_GETBODYHEIGHT        = 1024;
+SPORT_API_ID_GETFOOTRAISEHEIGHT   = 1025;
+SPORT_API_ID_GETSPEEDLEVEL        = 1026;
+SPORT_API_ID_SWITCHJOYSTICK       = 1027;
+SPORT_API_ID_POSE                 = 1028;
+SPORT_API_ID_FRONTJUMP            = 1031;
+SPORT_API_ID_ECONOMICGAIT         = 1035;
+SPORT_API_ID_MOVETOPOS            = 1036;
+SPORT_API_ID_SWITCHEULERMODE    = 1037;
+SPORT_API_ID_SWITCHMOVEMODE     = 1038;
+
+
+"""
+" error code
+"""
+# client side
+SPORT_ERR_CLIENT_POINT_PATH = 4101
+# server side
+SPORT_ERR_SERVER_OVERTIME = 4201
+SPORT_ERR_SERVER_NOT_INIT = 4202
diff --git a/unitree_sdk2py/b2/sport/sport_client.py b/unitree_sdk2py/b2/sport/sport_client.py
new file mode 100644
index 0000000..9ca34a3
--- /dev/null
+++ b/unitree_sdk2py/b2/sport/sport_client.py
@@ -0,0 +1,241 @@
+import json
+
+from ...rpc.client import Client
+from .sport_api import *
+
+"""
+" SPORT_PATH_POINT_SIZE
+"""
+SPORT_PATH_POINT_SIZE = 30
+
+
+"""
+" class PathPoint
+"""
+class PathPoint:
+    def __init__(self, timeFromStart: float, x: float, y: float, yaw: float, vx: float, vy: float, vyaw: float):
+        self.timeFromStart = timeFromStart
+        self.x = x
+        self.y = y
+        self.yaw = yaw
+        self.vx = vx
+        self.vy = vy
+        self.vyaw = vyaw
+
+
+"""
+" class SportClient
+"""
+class SportClient(Client):
+    def __init__(self, enableLease: bool = False):
+        super().__init__(SPORT_SERVICE_NAME, enableLease)
+
+
+    def Init(self):
+        # set api version
+        self._SetApiVerson(SPORT_API_VERSION)
+
+        # regist api
+        self._RegistApi(SPORT_API_ID_DAMP, 0)
+        self._RegistApi(SPORT_API_ID_BALANCESTAND, 0)
+        self._RegistApi(SPORT_API_ID_STOPMOVE, 0)
+        self._RegistApi(SPORT_API_ID_STANDUP, 0)
+        self._RegistApi(SPORT_API_ID_STANDDOWN, 0)
+        self._RegistApi(SPORT_API_ID_RECOVERYSTAND, 0)
+        self._RegistApi(SPORT_API_ID_EULER, 0)
+        self._RegistApi(SPORT_API_ID_MOVE, 0)
+        self._RegistApi(SPORT_API_ID_SIT, 0)
+        self._RegistApi(SPORT_API_ID_SWITCHGAIT, 0)
+        self._RegistApi(SPORT_API_ID_BODYHEIGHT, 0)
+        self._RegistApi(SPORT_API_ID_FOOTRAISEHEIGHT, 0)
+        self._RegistApi(SPORT_API_ID_SPEEDLEVEL, 0)
+        self._RegistApi(SPORT_API_ID_TRAJECTORYFOLLOW, 0)
+        self._RegistApi(SPORT_API_ID_CONTINUOUSGAIT, 0)
+        self._RegistApi(SPORT_API_ID_MOVETOPOS, 0)
+        self._RegistApi(SPORT_API_ID_FRONTJUMP, 0)
+        self._RegistApi(SPORT_API_ID_ECONOMICGAIT, 0)
+        self._RegistApi(SPORT_API_ID_POSE, 0)
+        self._RegistApi(SPORT_API_ID_SWITCHEULERMODE, 0)
+        self._RegistApi(SPORT_API_ID_SWITCHMOVEMODE, 0)
+
+    # 1001
+    def Damp(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_DAMP, parameter)
+        return code
+
+    # 1002
+    def BalanceStand(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_BALANCESTAND, parameter)
+        return code
+
+    # 1003
+    def StopMove(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_STOPMOVE, parameter)
+        return code
+
+    # 1004
+    def StandUp(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_STANDUP, parameter)
+        return code
+
+    # 1005
+    def StandDown(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_STANDDOWN, parameter)
+        return code
+
+    # 1006
+    def RecoveryStand(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_RECOVERYSTAND, parameter)
+        return code
+
+    # 1007
+    def Euler(self, roll: float, pitch: float, yaw: float):
+        p = {}
+        p["x"] = roll
+        p["y"] = pitch
+        p["z"] = yaw
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_EULER, parameter)
+        return code
+
+    # 1008
+    def Move(self, vx: float, vy: float, vyaw: float):
+        p = {}
+        p["x"] = vx
+        p["y"] = vy
+        p["z"] = vyaw
+        parameter = json.dumps(p)
+        code = self._CallNoReply(SPORT_API_ID_MOVE, parameter)
+        return code
+
+    # 1009
+    def Sit(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_SIT, parameter)
+        return code
+
+    # 1011
+    def SwitchGait(self, t: int):
+        p = {}
+        p["data"] = t
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_SWITCHGAIT, parameter)
+        return code
+
+    # 1013
+    def BodyHeight(self, height: float):
+        p = {}
+        p["data"] = height
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_BODYHEIGHT, parameter)
+        return code
+
+    # 1014
+    def FootRaiseHeight(self, height: float):
+        p = {}
+        p["data"] = height
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_FOOTRAISEHEIGHT, parameter)
+        return code
+
+    # 1015
+    def SpeedLevel(self, level: int):
+        p = {}
+        p["data"] = level
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_SPEEDLEVEL, parameter)
+        return code
+
+    # 1018
+    def TrajectoryFollow(self, path: list):
+        l = len(path)
+        if l != SPORT_PATH_POINT_SIZE:
+            return SPORT_ERR_CLIENT_POINT_PATH
+
+        path_p = []
+        for i in range(l):
+            point = path[i]
+            p = {}
+            p["t_from_start"] = point.timeFromStart
+            p["x"] = point.x
+            p["y"] = point.y
+            p["yaw"] = point.yaw
+            p["vx"] = point.vx
+            p["vy"] = point.vy
+            p["vyaw"] = point.vyaw
+            path_p.append(p)
+
+        parameter = json.dumps(path_p)
+        code = self._CallNoReply(SPORT_API_ID_TRAJECTORYFOLLOW, parameter)
+        return code
+
+    # 1019
+    def ContinuousGait(self, flag: int):
+        p = {}
+        p["data"] = flag
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_CONTINUOUSGAIT, parameter)
+        return code
+
+    # 1036
+    def MoveToPos(self, x: float, y: float, yaw: float):
+        p = {}
+        p["x"] = x
+        p["y"] = y
+        p["yaw"] = yaw
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_MOVETOPOS, parameter)
+        return code
+
+    # 1031
+    def FrontJump(self):
+        p = {}
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_FRONTJUMP, parameter)
+        return code
+
+
+    # 1035
+    def EconomicGait(self, flag: bool):
+        p = {}
+        p["data"] = flag
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_ECONOMICGAIT, parameter)
+        return code
+
+    # 1028
+    def Pose(self, flag: bool):
+        p = {}
+        p["data"] = flag
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_POSE, parameter)
+        return code
+
+    # 1037
+    def SwitchEulerMode(self, flag: bool):
+        p = {}
+        p["data"] = flag
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_SWITCHEULERMODE, parameter)
+        return code
+
+    # 1038
+    def SwitchMoveMode(self, flag: bool):
+        p = {}
+        p["data"] = flag
+        parameter = json.dumps(p)
+        code, data = self._Call(SPORT_API_ID_SWITCHMOVEMODE, parameter)
+        return code
diff --git a/unitree_sdk2py/b2/video/video_api.py b/unitree_sdk2py/b2/video/video_api.py
new file mode 100644
index 0000000..a4cb1b6
--- /dev/null
+++ b/unitree_sdk2py/b2/video/video_api.py
@@ -0,0 +1,16 @@
+"""
+" service name
+"""
+VIDEO_SERVICE_NAME = "videohub"
+
+
+"""
+" service api version
+"""
+VIDEO_API_VERSION = "1.0.0.1"
+
+
+"""
+" api id
+"""
+VIDEO_API_ID_GETIMAGESAMPLE = 1001
diff --git a/unitree_sdk2py/b2/video/video_client.py b/unitree_sdk2py/b2/video/video_client.py
new file mode 100644
index 0000000..79e1fb5
--- /dev/null
+++ b/unitree_sdk2py/b2/video/video_client.py
@@ -0,0 +1,23 @@
+import json
+
+from ...rpc.client import Client
+from .video_api import *
+
+
+"""
+" class VideoClient
+"""
+class VideoClient(Client):
+    def __init__(self):
+        super().__init__(VIDEO_SERVICE_NAME, False)
+
+
+    def Init(self):
+        # set api version
+        self._SetApiVerson(VIDEO_API_VERSION)
+        # regist api
+        self._RegistApi(VIDEO_API_ID_GETIMAGESAMPLE, 0)
+
+    # 1001
+    def GetImageSample(self):
+        return self._CallBinary(VIDEO_API_ID_GETIMAGESAMPLE, [])
diff --git a/unitree_sdk2py/b2/vui/vui_api.py b/unitree_sdk2py/b2/vui/vui_api.py
new file mode 100644
index 0000000..d5dcd34
--- /dev/null
+++ b/unitree_sdk2py/b2/vui/vui_api.py
@@ -0,0 +1,21 @@
+"""
+" service name
+"""
+VUI_SERVICE_NAME = "vui"
+
+
+"""
+" service api version
+"""
+VUI_API_VERSION = "1.0.0.1"
+
+
+"""
+" api id
+"""
+VUI_API_ID_SETSWITCH = 1001
+VUI_API_ID_GETSWITCH = 1002
+VUI_API_ID_SETVOLUME = 1003
+VUI_API_ID_GETVOLUME = 1004
+VUI_API_ID_SETBRIGHTNESS = 1005
+VUI_API_ID_GETBRIGHTNESS = 1006
diff --git a/unitree_sdk2py/b2/vui/vui_client.py b/unitree_sdk2py/b2/vui/vui_client.py
new file mode 100644
index 0000000..234f285
--- /dev/null
+++ b/unitree_sdk2py/b2/vui/vui_client.py
@@ -0,0 +1,86 @@
+import json
+
+from ...rpc.client import Client
+from .vui_api import *
+
+
+"""
+" class VideoClient
+"""
+class VuiClient(Client):
+    def __init__(self):
+        super().__init__(VUI_SERVICE_NAME, False)
+
+    def Init(self):
+        # set api version
+        self._SetApiVerson(VUI_API_VERSION)
+        # regist api
+        self._RegistApi(VUI_API_ID_SETSWITCH, 0)
+        self._RegistApi(VUI_API_ID_GETSWITCH, 0)
+        self._RegistApi(VUI_API_ID_SETVOLUME, 0)
+        self._RegistApi(VUI_API_ID_GETVOLUME, 0)
+        self._RegistApi(VUI_API_ID_SETBRIGHTNESS, 0)
+        self._RegistApi(VUI_API_ID_GETBRIGHTNESS, 0)
+
+    # 1001
+    def SetSwitch(self, enable: int):
+        p = {}
+        p["enable"] = enable
+        parameter = json.dumps(p)
+
+        code, data = self._Call(VUI_API_ID_SETSWITCH, parameter)
+        return code
+
+    # 1002
+    def GetSwitch(self):
+        p = {}
+        parameter = json.dumps(p)
+
+        code, data = self._Call(VUI_API_ID_GETSWITCH, parameter)
+        if code == 0:
+            d = json.loads(data)
+            return code, d["enable"]
+        else:
+            return code, None
+
+    # 1003
+    def SetVolume(self, level: int):
+        p = {}
+        p["volume"] = level
+        parameter = json.dumps(p)
+
+        code, data = self._Call(VUI_API_ID_SETVOLUME, parameter)
+        return code
+
+    # 1006
+    def GetVolume(self):
+        p = {}
+        parameter = json.dumps(p)
+
+        code, data = self._Call(VUI_API_ID_GETVOLUME, parameter)
+        if code == 0:
+            d = json.loads(data)
+            return code, d["volume"]
+        else:
+            return code, None
+
+    # 1005
+    def SetBrightness(self, level: int):
+        p = {}
+        p["brightness"] = level
+        parameter = json.dumps(p)
+
+        code, data = self._Call(VUI_API_ID_SETBRIGHTNESS, parameter)
+        return code
+
+    # 1006
+    def GetBrightness(self):
+        p = {}
+        parameter = json.dumps(p)
+
+        code, data = self._Call(VUI_API_ID_GETBRIGHTNESS, parameter)
+        if code == 0:
+            d = json.loads(data)
+            return code, d["brightness"]
+        else:
+            return code, None
\ No newline at end of file