Fuzzy control is used in wavefront correction and its feasibility has been confirmed because it does not depend on the response model of deformable mirror. The wavefront correction effect of fuzzy proportion integration differentiation (PID) control in adaptive optical system is assessed, including testing fuzzy correction bandwidth, selecting fuzzy input and output domains, and optimizing fuzzy rule base and wavefront weighted template. Experimental results show that the selection of fuzzy domain is reasonable, and the better results are obtained with a 3×3 wavefront weighted template. When the initial values of KP、KI and KD of PID controller are 0, the rule base with membership degree positive distribution is more suitable for the fuzzy output domain. When the refresh rate of the Hartmann-Shack sensor is 120 Hz, the system correction bandwidth is 5-6 Hz, which is consistent with the conventional PID.