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Diagnostic knowledge is the core of intelligent diagnosis system. Analyzing and comparing among traditional knowledge representation, object-oriented knowledge representation, standardized representation of AI-ESTATE diagnostic knowledge, diagnostic knowledge representation based on XML language and ATML standard, which summarize the development trend of knowledge representation of fault diagnosis and analyze the advantages and difficulties of using ATML to describe AI- ESTATE standard definition on a variety of test diagnosis knowledge. By means of a typical AI-ESTATE diagnostic knowledge type transformation method and description, the orientation is specified for the standardized description of the AI-ESTATE diagnostic knowledge based on the ATML standard. In view of the fact that the different definitions of language make the current description not efficient, indicating the direction of future standardized description development.