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It is difficult to develop the corresponding fault diagnosis system and the software reusability is bad because the engineering equipment type are so many and their performance is diverse. This paper discussed the solution to engineering equipment integrated fault diagnosis system based on component technology, put forward the system model and gave the system frame designment process and working principle. The software was designed based on the three-layer hierarchy. It is easy to reuse and maintain, and the operation of the software is simple. A kind of new theory and method to develop the engineering equipment fault diagnosis system for the future was provided.