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High-power hydraulic machinery is the key core component of the transmission system of heavy-duty special vehicles. In order to meet the requirements of high-speed, heavy-duty and high-reliability of the vehicle, on the one hand, it is necessary to improve the strength and reliability of the hydraulic mechanical transmission itself. On the other hand, it is necessary to establish and improve the condition monitoring and fault diagnosis system of the high-power hydraulic mechanical transmission. Based on the expert system and the failure physical model, the state monitoring and fault diagnosis system of the high-power hydraulic mechanical transmission is established for the common failure modes of the hydraulic mechanical transmission system and key components, which is divided into the torque conversion and blocking function monitoring and alarm modules , Shift prompt and alarm module, oil level monitoring and alarm module, system oil pressure monitoring and alarm module, and oil temperature monitoring and alarm module are five parts. The actual vehicle test proves that the high-power hydraulic mechanical transmission condition monitoring and fault diagnosis system can more effectively identify the potential failure and use risk of the system, or avoid the occurrence of serious faults through simple maintenance and maintenance before serious faults occur. Thereby reducing the demand for manpower and spare parts, and reducing guarantee costs.