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In order to solve the problems of multiple fault diagnosis in complex electronic equipment, a design method of multiple fault diagnosis based on correlation model is proposed.Firstly, the testability D matrix is determined according to the correlation model, and the elevance matrix indicates the relationship between component unit and test times.Secondly, the test result matrix is constructed according to the actual test results, and the test fault unit matrix is calculated.Finally, through synthesizing the data of test failure unit matrix and test times relation matrix, the probability of failure unit is determined, and the failure unit is located according to the failure probability.The example shows that the multiple fault diagnosis method can accurately locate the fault unit and greatly reduce the invalid maintenance activities.