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Aiming at the problem of current equipment health state evaluation methods can not reflect the changing process, a method of equipment health state evaluation based on testing data was proposed. This method observes the change rule and compares the normal range of test data by testing the equipment, calculate the basic health degree, the changing rate and changing range of health degree, a model of health evaluation in dynamic change process was proposed and a health state evaluation method for equipment of series and parallel system was established. Based on this method, actual measured submarine-launched missile engine and servo mechanism data were used for analysis, the result shows that this method can reflect the real health state during the changing process accurately, provide scientific fault prediction and maintenance decision basis, fit condition based maintenance requirement, improve equipment performance rate and mission capable rate, has a strong operational.