principle，based on the lateral Moiré fringe of auto-collimation angle measurement method，is analyzed by using

the shading principle of Moiré fringe displacement amplification effect. On the basis of the method to build the

principle of the optical path，the Moiré fringe signal is stable and can satisfy the measurement requirements. On the

basis of the system，data processing steps are simplified and dynamic measurement is realized. The quantitative calibration

experiment results show that the system resolution up to 10″，applying this method to the autocollimator can

significantly improve the resolution.