Abstract: A software solution for Ultrasonic Phased Array imaging system is presented in this paper. The software system is based on embedded Linux and Qt/Embedded, using modular design. The study of this paper places emphasis on the key technologies of software system. The imaging data transferring from FPGA to ARM is realized by DMA. And we achieved parallel processing of computing by multithreading with Qt, which have improved real-time performance of our system. Besides, all the data and files are managed well by the file class library of Qt and SQLite database, etc. The software system runs well, all performance indexes meet the requirements. Testing results show the design is reasonable and feasible.