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The auto part suppliers are the source of the automotive supply chain and play an important role in the manufacture resources. Its behaviour is closely related with the market and the quality. Its achievement directly affects the product quality, the marketing ability of the auto company, and the customer satisfaction. The article discusses the auto part supplierspsila evaluation criteria, which are put forward from the service ability, business enterprise ability, cooperation ability and sustainable development ability, according to the characteristics of auto companies, combining the trends of the automotive part industry. The article also presents the sub-essential factors. Taking the advantages of the grey characteristic based on the AHP for weight analysis, the integration method of the Analytic Hierarchy Process (AHP) and Grey Relative Analysis Process (GRAP) had been used in above evaluation model. The evaluation method can not only evaluate the sub-system of the complicated system, but also can be used in the comprehensive evaluation process based on the sub-system evaluation. An application example has been given at last.