Abstract: Single crystal PMN-PT can effectively improve the sensitivity and bandwidth of ultrasonic transducer. This paper introduces a medical ultrasonic phased array transducer based on PMN-PT single crystal material. The transducer is made of PMN-32%(001) single crystal material and designed with two matching layer structure. On this basis, a single crystal transducer was fabricated, and the echo signal test analysis was performed on it. The results show that the center frequency of the developed ultrasonic transducer is about 2.6 MHz, and the -6 dB relative bandwidth is more than 80%. It has good sensitivity and bandwidth.