The actual trajectory of the BL1A hailsuppressing/rainenhancing rocket has a major deviation from the curve provided by its manufacturer at high wind speed: the elevation angle of the shell body will increase when the rocket is launched downwind and decrease when the rocket is launched upwind; the shell body will slip rightward when there is crosswind from right side, and slip leftward when there is crosswind from left side. Also, the drifting of rockets in flight at high wind speeds will lead to the failure of rocket seeding into the effective part of the clouds. There are even cases in which rockets went beyond their safe limits, resulting in potential safety problems. A BL1A rocket ballistic curve corresponding to the standardized angle of departure is presented based on the experiences from operations carried out in recent years, and the wind correction is conducted by adjusting the angle of departure and the azimuth according to the condition of the ground and upperlevel wind speed and direction. The revised angle of departure can reach such accuracy that the flying altitude and the direction of the rocket can meet the requirements of the operations when catalyst is being seeded, and its selfdestruction point can be controlled within the expected range.