Using the intensity hypodispersion of the anti-Gauss distribution and visual C~(++) program,a series of interference fringes image shot with CCD fast processing method were obtained.To assure the information integrality of the interference fringes,the edge detection instead of binary method with the LOG operator in digital image processing and the effective thinning method of laser interference fringes with zero crossing in the morphology were used.Using the phase of laser interference thining friges,the micro displacement was measured.The experiment indicates that the program is available.The measurement accuracy can achieve one hundredths fringes interval.This method can realize optical measurement in the scale of submicron and millimicron.