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the evaluation method based on degradation trajectory is the main method for reliability evaluation of degraded products. It is suitable for reliability evaluation of highly reliable and long-life products with degradation failure mechanism. The reliability evaluation method based on degradation trajectory first selects the appropriate degradation trajectory model, uses the degradation data to fit the degradation trajectory to obtain the model parameters, then extrapolates the pseudo failure life according to the degradation trajectory, and finally uses the least square method to determine the failure distribution of the product based on the pseudo failure life, The distribution with the best fitting degree is selected by hypothesis test. This paper takes the accelerated degradation test data of high-power switch as an example.