The efficiency of ultrasonic level sensor can be improved by monitoring the fluctuation of liquid level in pump station. Although cable type liquid level sensor is still occupied the main market. Along with the increasing need of industrial sensors, traditional types of liquid level sensor will be eliminated from the market, instead is necessarily out of contact type ultrasonic liquid level sensor. Not just because of the efficiency of ultrasonic level measurement, and more importantly, when we use the ultrasonic liquid level sensor monitoring level for water pump or groundwater level, can timely access to water lifting and liquid level pressure data, is helpful for monitoring personnel to pumping station or urban water supply system can immediately make a decision and adjustment, maximum limit to reduce the adverse circumstances.