Abstract: Combining the cosine method and grey relational evaluation method, an improved grey relational method is proposed to evaluate the performanc of automotive supply chain which can determine the indicator weight and evaluation result more effectively. On the basis of these, the Performance Evaluation System (PES) of automotive integrated supply chain is developed on MATLAB software platform. In the end, the validity and feasibility of the system is validated by an example and the system can provide a convenient operation tool and scientific, objective decision basis for auto manufacturers to evaluate the automotive integrated supply chain performance.