In order to solve the problem of quick fault location and rapid maintenance for equipment hydraulic system,the IETM was used in maintenance support technology.S1000D 40 standard was introduced,the structure of maintenance support system for equipment hydraulic system was analyzed,then the system development process was studied.By analyzing equipment hydraulic system using the hierarchical decomposition method,the typical faults were analyzed using the fault tree analysis method,XMLSpy was used to write all kinds of data module.Equipment fault quick location and isolation,faulty part’s diagram and analysis are realized.So the efficiency of maintenance is improved,and it has important military significance.