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IEEE1232 defines a set of formal specification for diagnostics knowledge to all test environment,supports the portability and interplay of diagnostic knowledge and data.Fault tree analysis as a fault diagnosis method is widely used,but there are few standards such as IEEE1232 describes the application in detail,so the establishment of the fault tree diagnosis model based on this standard is the most important thing in the actual fault tree analysis.Firstly,IEEE1232 standard and its model composition are introduced,then the specific meaning and usage of some common elements are analyzed. All the elements and available methods about fault tree analysis in the standard are researched,and the fault tree diagnosis model is established based on these. Finally,a sample of exchangeable fault tree model file described by the EXPRESS language is showed.