Abstract: The principle and system of aspheric wavefront aberration measurement are introduced. The cylindrical wavefront aberration measurement was realized mainly by GPIHS interferometer with the phaseshift interferometry. The cylindrical standard mirror was calibrated by the aid of the absolute testing method. A standard accessorial reflecting mirror was incorporated into the beam path of an interferometer to build up a autocollimating system for measuring the aspheric wavefront aberration of paraboloidal, ellipsoidal and hyperbolic mirrors with the method of aberrationless point. This method will have the characteristics of higher precision, bigger datainformation capacity, larger measurement range, and can remove system error and adjustment error if it is combined with the phaseshift interference principle.