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How to choose combinatorial strength for testing is a key problem that is urgently solved in the prioritized methodologies of variable strength combinatorial test cases. The combined coverage ratio can meet the combination coverage criteria, but the ranking factor is single, the test case prioritization results are quite different, and the priority of the combined test cases can’t be adjusted timely according to the feedback information of the test results. In order to solve the above problems, this paper studies the prioritization method of combinatorial test cases based on One-test-at-a-time (OTT) strategy, using locally-interaction-coverage rate, test case failure rate and test case importance. In the testing process, the execution result is used to adjust the value of the sequencing factor achieve the purpose of updating the priority of the combined test case in real time. Experimental results show that compared with Random, ICBP, GISVSP and LISVSP methods, this method makes the prioritization results more stable, and the defect detection rate is competitive.