this text brief introduced that it is important that using quantity method to describe damages of warship for using our navy salvage and rescue forces rationally in the future war time,and give us an superficial study about basic quantity principle and method of damages degree of warship.

Based on the existing study of incoherent dual point-source counteracting anti-radar missile (ARM),the attacking process of ARM was researched through analyzing the homing and moving theory of ARM,and the error distance of ARM disturbed by dual point-source was probed into.

This paper builds up a relative kinematical model between short-range air-to-air dog-fight missile and the target based on the characteristics of attacking process.

Under the restriction of deorbitting with the least energy, the attacking process of the space-based strike weapon to the fixed target on the ground was studied and modeled specifically.

In the model, the threat was Abstracted as the aggregation of the system s states, and the attack process was depicted as the change of the system states aggregation.