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。这一现象将直接影响试验精度和对试件质量的评估。由于试件本身参数很难确定，尤其是当试件接近疲劳寿命时。为此，以往都是人工进行调整。采用了模糊控制技术后，将试验人员的经验用一定的算法表示出来，从而实现了对试验载荷的自动跟踪，较好地解决了上述问题。 The common problems existing in the fatigue test system are analyzed. That is, the peak value and the mean value of the test load drift with the change of the test time and the mechanical properties of the test piece. This phenomenon will directly affect the test accuracy and evaluation of the quality of the specimen. Due to the parameters of the specimen itself is difficult to determine, especially when the specimen close to the fatigue life. To this end, in the past are manually adjusted. Adopting the fuzzy control technology, the experimenter’s experience is expressed by a certain algorithm, so as to realize the automatic tracking of the test load and solve the above problems well.