Abstract: According to the synchronous principle of Single Network Time Protocol（SNTP） and IEEE1588 Precision Time Protocol，the test method and implement of EPA protocol time synchronization is researched.The test method and test system structure of EPA time synchronization are put forward.Also the test flow of EPA time synchronization is designed.The test platform of EPA time synchronization is developed.The practical application of test system indicates the validity of this test method.

摘要： 根据简单网络时间协议（SNTP）和IEEE1588精密时间协议的同步原理，研究了EPA协议中时间同步的测试方法与实现;提出了测试EPA时间同步的方法和系统结构;设计了EPA时间同步的测试流程，开发了EPA时间同步的测试平台。通过实际应用，证明这种测试方法能够准确地测试被测设备的时间同步精度是否符合EPA标准。