The invention provides an electric power plan making method based on an electric power automation system and an integrated data server. Firstly, a power plant make a next year preliminary plan according to a device regular check period and a defect condition, then the power plant sends the next year preliminary plan to a scheduling center, the scheduling center determines whether the plan is reasonable and agrees if the plan is reasonable, otherwise feeds back information to the power plant, and the power plant modifies the plan in dependence on feedback information until the requirement of the scheduling center is satisfied. The invention provides the plan making method, when the power plant makes the plan, through considering abundant external cause and internal cause, the making of a power plant unkeep plan is more scientific, when the scheduling center approves the plan, through considering a load change case, an electric power supply level is guaranteed to the maximum, the data in a present electric power automation system is fully utilized, the integrated data server is set to store the data which influences plan making, and the plan making is more precise and is more close to an actual situation.