A monitoring system based on 4G and VPN ( Virtual Private Network) is designed to overcome the drawbacks of traditional way and realize the demand of video monitoring in the remote areas. This video surveillance system uses ARM11 as the hardware platform,and works on embedded Linux operating system.It uses the V4L2 interface to capture image data,CPU integrated MFC module to code these image data to H.264 video stream with high compression ratio,and implements realtime video transmission by using RTP/RTCP protocol.Also,in this system,a VPN network is built by using VPN technology to solve the problem of private IP address when using 4G module access to the Internet.The experiment results show that the system has stable operation,smooth stream and low delay,and it can be used in various fileds.%为了克服传统视频监控系统的缺陷，实现在偏远地区进行远程视频监控的需求，设计了一种基于4G 和VPN（ Virtual Private Network）技术的移动监控系统。系统以ARM11为硬件平台，运行 Linux 操作系统，利用 V4L2接口从摄像头采集图片并使用CPU内部 MFC 模块编码成压缩率高的 H．264视频流，以 RTP／RTCP 协议进行实时网络传输。同时采用VPN技术，搭建专用网络解决了4G 私有 IP 地址的问题。经验证，该系统传输稳定、画面流畅、实时性高，可被应用于众多领域。
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