A wireless video monitoring system was developed with ARM and QT based on WiFi network. The system was composed of the remote embedded video acquisition terminal, WiFi network and the monitoring center. In this system, the hardware platform with PXA270 ARM microprocessor chip as its core is used to capture video and the Linux system is built up on it. The client software is developed by QT and the multi-thread technology as well in order to display the video from acquisition terminal by WiFi network. The experiment results showed that the real-time display of one-way or multi-way video monitoring image could be achieved. The system could satisfy the requirements of design and would be widely used in various fields.