According to the requirement of firepower assignment of modern antiaircraft, it reconstruct the index system that ascertain the air defense firepower unit opportune firing, and introduce the process of opportune firing algorithm in the base of certain firing availability coefficient , firing availability times and killing probability, connecting with the antiaircraft operation practice.

When scope sight and gun-barrel axis are not at the same vertical surface,the firing accuracy is also affected.

The increase of firing accuracy of indirect aiming firing gun,especially first-round hit accuracy,has the important meaning for artillery combat in modern war.

Improving the firing accuracy is the final aim in the structural optimization of machine guns.

Study on the Effect of Projectile Initial Velocity on Fire Accuracy of Gun;

Using the result, fire accuracy of various shooting method is analyzed.

Accoding to these formulas,we can regulate natu-ral vibration of the system and implove fire accuracy by regulatinganyone or all of the following quantities, su.