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In order to solve the complex electronic equipment and hard to predict the fault, and existing methods cannot predict the state of the electronic equipment and other issues directly , we propose least square support vector machine and hidden Markov model portfolio fault prediction method. First, according to sensitivity analysis to determine the circuit elements to be changed to set the circuit by changing the parameters of the different components degraded state; secondly, create a combination failure prediction model; Finally, the circuit state prediction. The results show that the proposed method can directly predict the different states of the circuit, so as to realize the fault state prediction of the electronic equipment directly, the prediction accuracy can reach 93.3%.