With the development of Internet, various kinds of applications based on Web are widely supported in the field of industrial control. At present, the compatibility of the coal mine monitoring system is poor, and the level of network is low, this makes that it's hard to attemper and manage unitedly. In order to improve the scientific and practical level of the attemperring and management, it's imperative to realize Web services and unitedly remote-monitor and manage field data on the basis of data integration of monitoring systems.The paper discusses the safety condition of coal production and the developing station of coal mine monitoring systems. In order to resolve the problem of coal mine monitoring systems interconnection and meet the need of coal mine anagement, the paper completes the following works. Firstly, the paper analyses how does Web apply to coal mine monitoring systems. Secondly, the paper discusses the principle of Web database accessing and data traffic, particularly the method used in this paper, ADO.NET and Winsock. And the paper analyses the important technology used in Web empoldering, including XML, SOAP, Web Service, and ASP.NET. Thirdly, the paper presents the design project of remote-monitoring system, designs the software of every module, and realizes the Web server and the client browser. Finally, the paper completes the design of a remote-monitoring system of the gas based on Web, and it is composite structure of C/S and B/S.The test result of this system indicates that it works normally and reaches the design goals, and it has been successfully applied in a coal mine in Shanxi province. The system has the function of network sharing and remote monitoring, it meet the requirements of monitoring and managing gas condition comprehensively, real-time, and chronically. This system laid the foundation for building coal mine monitoring system covering the mining bureau, the whole city, the whole province, and even the whole country.