The utility model discloses a night measurement system, the last ultrasonic sensor that is provided with of micrometer frame, the last alarm that is provided with of micrometer frame can use together through ultrasonic sensor and alarm, and through the relative change that ultrasonic sensor measured every measurement station container bottom surface location elevation and liquid level, the rethread calculates tries to achieve the each point for the relative sinkage of basic point, and the alarm is reported to the police when above the certain limit, improves its degree of automation, be provided with the inductor on the LED bar lamp area, can be when needs to carry out reading of data and operate, just can shine in LED bar lamp area to it is extravagant to reduce the energy, the upside of surveyor's level is provided with the buckler, can protect night measurement system, and is long when increasing its use. This night measurement system has degree of automation height and the long advantage of live time, has wide market prospect.