Abstract: For generally high cost and long cycle characteristics of the development of digital video surveillance equipment,based on ARM + Linux embedded platform,use open source free software MJPG_Streamer to implement acquisition of video image and transport them to the host computer through the TCP/IP network protocol for remotely display.A target detection algorithm combined with three frames subtraction and background subtraction is proposed to implement intelligent control.The experimental results show that the system can monitor in real time and remotely,while rapid voice alarm to invasion of the target.