A field calibration method for the lin e st ructured-light vision sensor is put forward.A plane target with solid circle array is designed.A calibration mathematical model is established,and a coordinate mapping approach is proposed.Based on the coordinates of the feature points in image coordinate system,the corresponding coordinates in target coordinate syst em,and the intrinsic parameters of the camera,a transformation matrix from target to camera coordina te system is estimated. Using the transformation matrix,the coordinates of the feature points in camera coordination system are calculated.The target is freely put within the field of vision at different pos itions and postures several times,and more feature points are extracted.In camera coordinate system,all feature points are fitted to an ideal plane.And the equation of the line structured-light plane is obtained in the c amera coordinate system.The experiment is performed to test the precision o f the calibration method.The result shows that this calibration process is simple,and the calibration precision is high.It can be used to calibr ate the line structured-light vision sensor on spot.