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In the areas such as aviation, aerospace and communication, high reliability and long life design products are widely used. Assess of the performance degradation status or prediction of the remaining useful life have great significance in enhancing system safety, increasing maintenance efficiency and reducing total life cycle cost of the system. To cover the shortage of life and reliability data in domestic health management, the system representative modeling process is presented. Especially,the existent problems for further research of life model and modeling simulation are investigated, which is to obtain the life model easy to fulfill and with high-fidelity. Then it can be hoped to provide efficient data support for further performance degradation status assessment. 