This paper analyzes some aircraft parking stability in the situation of comparatively strong crosswind(wind speed is above 35m/s) based on wind tunnel test. It demonstrated that positive pitch moment is generated by perpendicular crosswind. By the method of parts-dismount, it is found that vertical tail is the main reason. After test, the distribution of the surface pressure was estimated in the situation of crosswind by CFD simulation ,and relevant explanation is conducted as a complement for this conclusion.