Aiming at the problem that the occurrence probability of each basic event in the maintenance of carrier-based aircraft can not obtain the fastest troubleshooting strategy, an importance index combining failure probability and inspection time is proposed to formulate the troubleshooting strategy. The importance of troubleshooting and the importance of the second troubleshooting are calculated by the formula containing the occurrence probability of the bottom event and the inspection time. Taking the failure of the arresting hook as an example, the troubleshooting strategy is formulated and verified by Monte Carlo method. The verification results show that the total troubleshooting time of this method is short.