Propagation p roperties of high2order Bessel2Gaussian beam through a misaligned first2order ABCD system have been studied by using the generalized Huygens2Fresnel diffraction integral and augmented matrix. It is shown that, as a high-order Bessel2Gaussian beam passes through the misaligned first-orderABCD system, the beam shape isn’t preserved, changing one ring to two rings. We can adjust size of dark region through adjusting the misaligned transverse vector E. The diffraction patterns and profile for high-orderBessel-Gaussian beams propagating through the lensmisaligned optical system have been illustrated.