The propagation approximation analytic expression and the propagation properties of the highorder BesselGaussian beam through the annular aperture has been studied by using the method of compound Gaussian function. The effect of the output beam caused by different inner and outer radius of the annular aperture also has been analyzed. The results show that, the diffractive properties relative with the width and inner radius of the diaphragm. The same intensity peaks will appear under proper value of the inner radius and width of the annular aperture.