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In order to get the fault detecting and diagnostic strategy of the air defense missile autopilot and reduce the cost of autopilot testing, a testability model of autopilot was built and analyzed, and the difficulties to build model were solved. The relationship between system structure and test points was caculated with multiple level abstraction and hybrid reasoning algorithm the information flow model was built according to the test points characteristic and working principle of autopilot. on this basis, the testability model was described by the relativity matrix between failure and test according to the testability model, the diagnostic strategy constructing method was designed. The practical application shows that the modeling approach is exactly correct and the built testability model could construct effective detecting and diagnostic strategy which is able to reduce the time of autopilot testing.