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Arming at the aerospace vehicle abnormal and failure cause by FPGA single particle effect in the space environment, the FPGA circuit is devised some levels with "computing unit + memory/trigger" via analyzing the characteristics of the FPGA circuit based on space and time dimension . Combined with the location importance, the connection degree among the nodes and the nodes' own soft error probability, an importance analysis model is proposed. And then the testing points are optimized based on the importance of each node using the proposed importance analysis model. The test results indicate that the method is a feasible optimization method.