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The military aircraft health assessment has the problem of difficult application in engineering practice. The military aircraft is taken as the research object of health assessment, including task-oriented capability analysis, function analysis based on fault degradation and parametric health assessment. The two-level mapping of "aircraft-mission function-impact parameters" based on mission analysis is obtained as the object of health assessment. The degradation, severity and maximum entropy modification are comprehensively utilized. The results of aircraft health assessment are obtained by interval analytic hierarchy process and other methods. In combination with the specific example object and parameter analysis results, this assessment method has high reliability, and high engineering practical value.