A new wavefront analysis method is proposed for collimation testing of laser beam. Based on the definition of wavefront rise wavefront analysis method of CCD scan is introduced. Wavefront rise is obtained by measuring the distance between the two same fiducial diffraction planes of the sampled wave. Therefore, the degree of collimation is determined. The principle of measurement and simulated fiducial diffraction patterns are given before experiment is made. The results demonstrated the feasibility of the method. The method holds a definite advantage in simplicity, and it is applicable for checking the degree of collimation of noncollimated wave.