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Hydraulic pump is the heart of the hydraulic system and its hydraulic system fault diagnosis is an important part of fault diagnosis. As the fluid compression, pump source and the servo system of fluid-solid coupling and hydraulic pump itself has a significant inherent mechanical vibration, making hydraulic pump failure mechanism is very complex, difficult to fault feature extraction, fault diagnosis fuzzy strong. A large number of hydraulic pump fault diagnosis data indicate that the source of export through the pump to detect the fault signal interference signals are often submerged, a single fault detection signal Changchengnongxing emerged in the ambiguity of strong, using conventional signal processing methods is difficult to enhance the fault characteristics effectively.