Abstract:Directional attack mode is used by the mine which attacked predetermined area, so attack area in the sea surface was expanded. this paper first briefly introduces the working process of the active attack mine, the test statistical problem of mine hit probability are analyzed, the method which used separate tests to obtain mine's hit probability was proposed, by theoretical analysis and formula deduction, a set of statistical model of active attack mine's hit probability was built. This effort lays the foundation of underwater armament test and mine blocking efficacy analyzing for follow-up work.