Abstract: The ultrasonic phased array detection and imaging software system are built in this paper based on embedded Linux and Qt/Embedded. Combining the interrupt mode and the DMA (Direct Memory Access) transmission, the software and hardware communication interface driver is designed to complete the data interaction between the FPGA (Field-Programmable Gate Array) and the ARM (Advanced RISC Machine). A human-machine interaction interface is built. The upper level application program is designed according to the system function using modular design idea. The corresponding code is written to complete the function of echo data processing and imaging. The system is tested through the experiment. It runs normally and meets the design requirements.