The driving power of the waterproof transmit-receive ultrasonic ranging transducer is relatively large. The natural vibration of the transducer leads to a blind distance as long as 30 cm, limiting its engineering applicationswhen the excitation source is removed. In this paper, a method that can markedly reduce the natural vibration is presented. First, the equivalent circuit model is established, and the generation mechanism of natural vibration is analyzed. A natural vibration restraining transducer driving circuit mainly based on field-effect tubes is schemed out. Since the echo signal of the natural vibration restraining circuit is comparatively weak, the background noise canceler circuit and the pulse signal superposition circuit are designed to increase the sensitivity of the echo. The echo timing is accurately estimated by detecting the knee point of the output curve of the pulse signal superposition circuit. Experiments show that the method can effectively reduce the natural vibration, and that the blind zone is limited to about 16 cm. This research expands the engineering applications of ultrasonic ranging.