In order to solve the problems existing in the evaluation of interception effectiveness of weapons and equipment, such as incomplete selection of evaluation index and strong subjectivity of determining evaluation weight, a method for evaluating the effectiveness of interception protection based on a new type of ultra-short range active protection system is proposed. Based on the PCDM formula, according to the Code for the Design of Conventional Weapon Structures for Protection Engineering and the TM585 calculation software of the United States, the protective risks and damage effects caused by the interception and explosion of incoming projectiles on the protection targets are analyzed from 3 angles: explosion collapse thickness, shock wave and fragments. The analysis results show that this method can provide a reference for the evaluation of the protective effect of the new protective system.