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As a essential evaluation criteria, coverage analysis can only help to revise the test case design faults due to input deficiency. The research is aimed at test case design faults in the aerospace embedded software testing which do not influence coverage. From the two core elements, test steps and anticipations, ten typical faults are proposed, analyzed, and revised. The evaluation results show that these faults are typical because of high happen rate. After the revision, software faults can be found effectively, and test adequacy can be improved through the connection with the coverage analysis.