During the high accurate measurement,it needs to calibrate the value of the CCD pixel in order to fit the accuracy required.In this paper a simple and convenient method for calibrating the CCD pixel with standard line-scale is introduced.The line-scale is calibrated by laser interferometer.We can get the number of pixel corresponding to a length of standard line-scale.Then we can get the real distance corresponding to every pixel.The results of the experiments show that this method can restrain the composit...