To analysis the challenge confronted with missile tracking because of aircraft's post-stall maneuvers, the mathematical model of the post-stall maneuvers was given, and simulations were done. Then the effect about post-stall maneuvers on missile guidance system was analyzed. The results of the analysis are: the movement parameters of "Herbst" maneuver vary dramatically, so the position guesstimate is unapt based on stationary movement. The guidance tends to lose target where the aircraft does "Herbst" near missile in relatively high speed. In order to solve the problem of tracking post-stall maneuvering target, fit filter is needed.