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Software as a Service (abbreviated as SaaS) is a new informationization model that promoted for SMEs. This paper analyzes the basic characteristics and application areas of SaaS at first. Generally speaking, the departments and branches of coal enterprises are located in various places, and its business is also more similar to the other. So authors propose to develop information system based on the SaaS model for coal enterprises, and give the steps to implement. This program can solve many problems in the informationization of coal enterprises, such as uneven development, huge investment and low rate of growth and so on, and improve coal enterprises informationization developed in depth.