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The testability is one of the general quality characteristics in equipment, and the design level of testibility is an importment factor which affecting the support effectiveness playing, and how to evaluate the testability of equipment more authentically is the focus of current research. In the development stage, the objective testability test data from physical experiment are few, difficult to obtain and expensive, which can be considered as "small sample" data. In order to evaluate the testability of equipment more comprehensively and objectively, it is necessary to make full use of testability simulation test to obtain simulation data for fusion evaluation. When conducting testability simulation test, the simulation model, fault model and simulation fault injection method of electronic equipment are studied to obtain testability simulation data. On this basis, the simulation test data is treated as pre-test information and combined with the physical test data of "small sample" equipment, the testability of the equipment is evaluated by integrating the testability test data with the Bayesian method, so as to improve the objectivity and credibility of the evaluation results. Through case analysis, the effectiveness of the testability fusion evaluation method is verified.