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With the in-depth application of intelligent support, PHM and other technologies, the importance of reliability, safety and testability (hereinafter referred to as "three characteristics") is becoming increasingly prominent. It is urgent to solve the "three characteristics" of repetitive work, professional island and "two skin" phenomenon in engineering. From the perspective of system engineering, this paper first analyzes the main work contents of "three characteristics", which are all carried out closely around the logical relationship of function failure, unified modeling and model reuse. Secondly, based on the function model, the logical relationship of fault is projected, which is closer to the real situation of fault transmission and solves the "two skin" phenomenon. Then, the modeling elements and evaluation contents of the "three properties" are comprehensively analyzed, and the information of the special part is processed, so that the "three properties" work is no longer an island. Finally, the fuel system is taken as an example to carry out the modeling and evaluation. Based on the functional fault logic model, the reliability, safety and testability of the fuel system are modeled and evaluated respectively to achieve model reuse and reduce duplication of work; Professional collaboration improves work efficiency; Close combination of functions, solve the "two skin" phenomenon.