A field calibration for laser scanning probe is put forward. Based on the model of camera calibration, the mathematical model of the laser plane is built. In order to get the more accuracy feature points, a new method using two alternate laser stripes which are not parallel to project on the chessboard is designed. The target is put in several different positions within the field of the camera vision aiming to get more feature points. All these feature points are fitted to an ideal plane after coordinate transformation. And the equation of the laser plane is obtained in camera coordinate. Experimental results indicate that the mean calibration error is less than 0.028mm. Using CMM to test the distance precision of the laser plane, the results show that the max distance error is 0.031mm. Experimental results indicate that the calibration technique has high accuracy and this method is suitable for field calibration.