Abstract: A realization method of high-precision phased transmission and parallel processing of phased echo in ultrasonic phased array(UPA) system is developed, so the transmission and reception phase of elements in the array can be controlled accurately, and phased echoes can be processed in real time. The analysis result shows that FPGA with high-speed counters and ample high-speed I/O pins and DSP hard-cores is suitable to phased array ultrasonic system greatly; the high-precision phased transmission making use of high-speed counters in FPGA can achieve delay resolution of 2ns; the high-speed I/O pins and DSP hard-cores in FPGA is used to realize parallel signal processing, and the measure of doing interpolation in 2 ns firstly and doing 10 ns delay compensation secondly is used to achieve the high-precision phased reception. The test result shows this realization method can accomplish real-time and vivid image of defects in steel tube perfectly.Keywords: