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The testability verification test is a main verification means to verify testing level of the guided projectile for naval guns, fault injection is a effective method to verify testing level, the guided projectile for naval guns is tightly packaged, fault injection is difficult,some fault modes can not be realized and fault coverage is low,how to optimize the fault injection method and reduce the cost of fault injection has become an urgent problem to be solved.The fault transfer characteristic is studied from the fault mode of a certain guided projectile for naval guns, the relation is established between fault and state, fault and fault by using fault transfer characteristics, the test equivalent fault correlation matrix is obtained by using Bayesian network multi-tree propagation algorithm, it can effectively improve the coverage of faults, and optimize the injection method of testability fault, and perfect the testability verification test by using equivalent fault instead of injectable fault. Finally,it makes the testability verification test more complete and the testability level verification results more reliable，the main fault modes of a guided projectile for naval guns are covered completely.