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Based on Atmel Corporation's microcontroller ATmega16L and ultrasonic sensor TCT40-16F, designs an ultrasonic measurement and alarm system with high precision. Using the method of MJ echo capture, the system can realize measuring the distance well and truly, and can send the real time distance data to the LCD screen of system. Once the distance was less than the setting value, the system would alarm immediately. In addition, the system uses temperature sensor for temperature compensation, which effectively improves the ranging accuracy. Experimental results show that the system has high range accuracy, and can complete the distance task of reversing radar, and has high value and broad application prospects.