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In order to validate UAV whether or not could be adapted for complex meteorology, the key aerodynamic parameters must be simulated on initial stage of conceptual design. To research dynamic response of partial parameters, when UAV encountered longitudinal gust, numerical aircraft and wind field model were established. Flight simulation was lasted 90 seconds and accomplished at the end. The result shows that, the fluctuations of aerodynamic parameters are acceptable, and the stability comes back after longitudinal gust vanish. The simulation will be beneficial to system design and flight test on the later stage.