In order to verify the validity of the liquid crystal adaptive optics imaging technology for the correction of the aberration caused by atmospheric turbulence and to improve the energy utilization of the optical system，Zemax is used to design the liquid crystal adaptive optical system and to evaluate the characteristics of the system.Obtained Modulation Transfer Function(MTF) of the liquid crystal adaptive optical system is very closed to the diffraction limit and the modulus of the MTF is 0.4 at 50 lp/mm.For the specific requirements of detection and correction for a optical path in the open-loop adaptive optical system,the specific tolerance principle is established.According to the tolerance analysis, it is shown that the adaptive optical system has a more relaxed tolerance condition,and it is easier to achieve processing and alignment.The limited resolution of the CCD is 31 lp/mm,which means the resources of CCD has been utilized effectively.After matching a 1 200 mm telescope,the focal length of the whole optical system is 19.9 m, the F number is 16 and the peak-valve(PV) value is 0.031 4λ.