In order to improve the accuracy of robot tracking the desired path and improve its work quality,a robot path control method was designed based on sensor measurement and least square method.The robot measurement system was constructed by using three laser distance sensors,and the measurement distances of three points on the plane were obtained by using the distance sensor to calculate the distance between the end effector and the surface.The normal vector of the surface was used to describe the surface at any point on the surface.Through the position of the tool center point and the rotation matrix,the position of each measuring point on the surface was obtained,and then the distance and intersection position from the tool center point to any point on the surface were calculated.The z component of the approximate surface was obtained by using the quadratic coefficient matrix,and the current and previous measurement points measured by using the distance sensor were used to determine the unknown plane and paraboloid parameters by using the least square approximation,and then the path direction and tool direction were obtained according to the desired path,so the tracking of the desired path was realized.The results show that compared with the fuzzy PI control method,the proposed method has high accuracy in tracking the plane and the stereo expected path,which verifies that the proposed method can be used to control the desired path accurately and provide reference for improving the work quality of the robot.