Abstract: The data transmission rate of ultrasonic phased array system determines the detection speed to a great extent. As a result, the efficiency of PCI device driver is critical in the ultrasonic phased array system based on PCI local bus. The developing methods and implementations of PCI device drivers using three different development tools, WinDriver, DriverStudio and WDK(Windows Driver Kit), are expounded in detail. The efficiency and compatibility of drivers by adapting different solutions are compared. Experimental results show that both the stability and data transmission rate of the driver developed by DriverStudio can meet the requirements of the ultrasonic phased array system. There are different requirements in different applications. As so, one should choose the developing solution comprehensively according to the specific requests to obtain the proper device driver and application program.