Abstract: Nowadays the ultrasonic phased array imaging detection technology has an increasingly wide application in the field of industrial non-destructive testing. By controlling the delay time of each element, the technology can change the location of the focus point and the direction of the beam and therefore form combined phased beam, complete ultrasonic scanning imaging .This paper studies the design of ultrasonic transmit-receive circuit. And use ultrasound test block is used to verify the feasibility of the single-channel ultrasonic testing circuit. The actual phased array ultrasonic detection circuit is a repeated combination of the single-channel circuit and the FPGA is then used to achieve detection.