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Considering the parameter selection and the index determination of testability are mainly based on expert experience, or in accordance with industrial routine, which cause application scope of selected parameters set to be small and randomness of selected parameters to be big, the proposed index may be too high or too low, the method of testability parameter selection and testability index determination of diesel engine are designed on the basis of the analytic hierarchy process and the eclectic approach, respectively. The minimum threshold value of testability parameter selection and testability index determination of diesel engine are determined, which provides the basis for the next testability modeling and analysis. INTRODUCTION Testability is one kind of design characteristic that system and equipment can determine its working status and isolate its internal faults timely and accurately[1]. It is key factor that determines equipment effectiveness similar to the reliability, maintainability, security and supportability[2]. In the actual engineering application, the testability parameters most depend on the expert experience, or select in accordance with the industrial routine, which cause application scope of selected parameters set to be small and randomness of selected parameters to be big, reincrease or re-decrease of parameters exist, the proposed index may be too high or too low. It is not comprehensive to describe the testability level with only a few parameter indexes for complex systems. According to incomplete statistics, the total number of parameters is more than 100, and it is not practical to use it completely [3-4]. Therefore, it is necessary to optimize and select the testability parameters to determine a set of proper and scientific testability parameter set; study the determination method of testability parameters, determine the minimum threshold value of testability parameters, and provide the basis for the next testability modeling and analysis.  Xiaoming Zhang, Yuanhong Liu, Department of Mechanical Engineering Academy of Armored Force Engineering, Beijing, China

Method Research on Parameter Selection and Index Determination of Testability for Diesel Engine