The general problem in the fatigue test system that the amplitude and mean of load signal will be changed with test time and change of mechanical characters of specimens is analyzed.

分析了疲劳试验系统中存在的普遍问题，即试验载荷的峰值和均值随着试验时间和试件的机械性能变化而发生漂移。

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The general test method, existing problem and its causes were analyzed, and a new test program was proposed.

分析了一般测试方法与设备存在的问题与原因，提出了新的测试方案。

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Actually, the problem isn't just an aerospace problem but a general problem that can be seen in many structures we test.

实际上，这不仅仅是一个航天问题，而是在我们所测试的很多结构上都可以观察到的一个普遍问题。

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