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Traditional PID (proportional integral differential) control occupied the main position in the process of liquid level control, but because of the liquid level control system, especially the system of the malfunction of the sensor is easy to make PID control method has the defects of lack of ability to resist failure, caused heavy losses of life in the production, so the need of fault diagnosis for liquid level control system running state and judge for abnormal situation, and provide the basis for system maintenance, according to the results of the diagnosis of the fault-tolerant control system makes the liquid level sensor failure could be run normally, still put forward state observer to estimate liquid level sensor fault values of fault-tolerant control system, the state observer for fault status tracking, and the fault state role in the original controller and make the original controller dumping existing fault of sensor signal, the fault value is offset.