In this paper, the wavefront properties of large aperture optics such as neodymium glass, reflecting mirrors and crystals have been systematically studied. Static and dynamic wavefront aberration of multi-beams laser system have been statistically analyzed. The results show that one kind of optics have similar wavefront properties, and different laser beams also have similar characteristics on static wavefront aberration. The chief static aberration of main amplifier is astigmatism with the PV value about 2λ～3λ (λ=1053 nm), and in 90° rotation reversal multi-pass amplifier laser system, the chief dynamic aberration of main amplifier is defocus with the PV value about 4λ～5λ. After excluding defocus, the dynamic wavefront aberration PV value is about 1λ～2λ, and maximum aberration of the whole laser system is likely to exceed 6λ.