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Existing active power control methods mostly take one wind farm as unit and regulate its active power independently, which cannot effectively satisfy comprehensive active power control demands of large-scale wind power base. Therefore, this paper proposes an active power coordination control strategy for wind farm cluster (WFC). The corresponding control system is divided into four levels - wind energy management level, collector station regulation level, wind farm regulation level, wind turbine execution level - by using hierarchical principle. At the same time, in order to adapt to the complex and changeable operation situation of power system, five operational modes are proposed, which are Normal Operation mode, Peak-load Regulation mode, Frequency Regulation mode, Emergency Reduce mode and Communication Fault mode. The simulation results of a typical wind farm cluster of Jiuquan 10GW wind power base show that the coordination control strategy can not only guarantee the security and stability of power system but also make full use of wind energy to some extent.