There are many advantages of ultrasonic phased array testing technology, such as improved sensitivity, resolution and signal to noise ratio. Based on FPGA technology, the receiving signal was .controlled to achieve the voltage isolation, amplification, filtering and then was converted to the function of LVDS signal. The miniaturization of ultrasonic phased array receiving control system and high speed data transmission was realized. The experimental results showed that the signal processing system was stable to meet the requirements which had important meaning to improve the phased array receiving system .