Thermal batteries are widely employed in various tactical weapons due to their high energy density， wide temperature range， strong instantaneous pulse resistance， short activation time， and long storage life. The output end of the thermal battery is the electrical interface for docking with the missile， and its backflow current during activation directly affects the reliability of the electronic equipment on the missile. Meanwhile， the influencing factors are studied to grasp the variation law of backflow current during thermal battery activation. The research shows that the backflow current is related to the number of parallel battery stack connections， the burning rate of the pilot strip， the burning rate of the heating plate， the stage plate area， the melting rate of the electrolyte， the number of single cells in series of the battery stack， the activation mode of the ignition head， line resistance， and the load power on the missile. This conclusion provides favorable support for designing a safe and reliable power supply circuit for the missile electrical system.

Missile testing is required to ensure that the real-time state and performance of an anti-aircraft missile can be obtained during its full life cycle. Reasonable testing item design is the basis to ensure the feasibility of the missile test process and the credibility of test results. Test item planning is closely related to missile testability design， and missile types and testability design ideas affect the design results of test items. Through the analysis of the combat process of anti-aircraft missiles with combined guidance， this paper proposes a planning strategy for the test items of anti-aircraft missiles and analyzes the associated factors in practical application. The test items formed on this basis can have good test coverage and feasibility and meet the all-stage test requirements of the missile during its life cycle.