Aiming at the calibration problem of the position parameter of camera and screen in vision-based specular surface measurement ,we propose a fast and simple calibration method based on mirror. A LCD screen is used to project a new circle-based pattern, then a camera captures the image of the pattern in the mirror, and the camera calibration is performed. The internal and external parameters of the camera are obtained after camera calibration. We can obtain the real position of the calibration pattern according to the theory of mirror imaging. In the calibration process the mirror can be moved freely without knowing its positions. Simulation and real experiment results show that the proposed meth- od is simple and fast, and has high calibration accuracy, which satisfies the requirement of actual measurement.