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In order to realize the rapid fault diagnosis of electronic devices or electrical systems, the martial arts sequence needs to be generated in the failure diagnosis. Generally, through the analysis of the martial arts test, the sequence of point-to-fault lattice and isolation can be obtained that the product test sequence generation efficiency track is a tree. However, according to the different failure rates of different failure modes, the test cane children and the cost of different test points are different, and the row guidance trees formed from different test points are also different. A test sequence generation algorithm based on A0* information heuristic Rollout strategy is proposed, which is a near-optimal settlement method that considers both reliability and minimal test cost, which not only reduces the huge amount of computation, but also obtains better diagnostic results than the suboptimal heuristic algorithm.