Abstract: In wireless sensor network (WSN), gateway is the bridge connecting wireless sensor networks and the external network. Based on ARM9 and embedded Linux system, a multi-function data terminal was designed which used for data transmission, data real-time display, data local storage and historical data query, including hardware and software. The hardware is mainly consisted of an ECU, a GPRS module, several wireless sensors. And the software is composed of interface module, dialing module, remote data transmitting module, and data collecting module. The system is multi-function and has wide applications. Graphical interfaces illustrate the function above using MINIGUI, and can be operated by touch screen easily. Through the experiment in lab, the multi-function data terminal designed can work stably and reliably, and is worth of practical application.