Ultrasonic probe is a key component of ultrasonic imaging equipment, its task is to convert electrical signals into ultrasonic signals or ultrasonic signals into electrical signals. The probe acoustic head oscillator is the synchronous trigger signal generator, which generates the synchronous trigger pulse that controls the operation of the system, and determines the repetition frequency of the transmitted pulse. After being triggered, the transmitter generates high-voltage electric pulse to stimulate the ultrasonic transducer to send ultrasonic pulse to the detection target. The echo pulse signal formed by the target is received by the transducer and converted into electrical signal, and then enters the echo information processing system. The system is composed of a radio frequency signal receiving amplifier, a detector and a video amplifier, and is displayed by a monitor. The scan generator outputs the scan signal to the display under the control of synchronizing pulse generated by the oscillator, so that the display of ultrasonic echo image is stable.