The characteristics of the micro-downburst accompanied with rain are complicated, which will produce certain deviations on the artillery range, side deflection and other parameters, and have a great influence on the shooting accuracy of the artillery. With 155 mm artillery shells killed as the research object, and fluid mechanics to establish on the basis of the principle of vortex ring under micro-downburst and raindrop movement model and fused into a micro-downburst accompanied with rain model suitable for ballistic analysis and calculation, and will strike suddenly and violently under micro-downburst accompanied with rain model combined with artillery 6 degrees of freedom ballistic equation, the simulation and analysis of different initial vortex ring center induced velocity of cannon shot and flexure of two kinds of means of transmission the influence of firing accuracy. Experimental results show that for the trajectory with low extension, the proportion of lateral deflection and yaw angle increase decreases with the increase of the initial central vortex ring induced velocity. When firing at a long distance, the artillery range decreases with the increase of the initial center induced velocity, which seriously affects the shooting accuracy and killing effect of the artillery.