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The technology of health condition assessment can provide the ways and means to quantify the the health status of aircraft. It can provide the technology foundation for the decision making of the aircraft maintaince by the use of the health index of the aircraft. On the basis of the analysis of the current situation, it studied the health condition assessment method at the whole aircraft level. The technology scheme of the health condition assessment is propoesed, and the Boeing AHM health index model is studied, too. The proposed health condition assessment method can shift from the traditional method of identification of failure to detection and quantitative description of the performance degradation degree. The application of the method can provide a reference to the operation and arrangement of the aircraft, and support the decision making for the reasonable arrangements of maintenance plan.