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this thesis reviewed the choices of cooling systems of hydraulic generator in Ertan hydropower station; talked about the new understanding of air cooled system of hydraulic generator recently.It is called "if the hydraulic generator can be cooled down by air cooled system,no internal water cooling system will be used."; also it introduced the assured process and relative course of hydraulic generator air cooled systems in Longtan Hydropower Station,the Xiaowan Hydropower Station and Laxiwa Hydropower Station; proposed the idea that "steam cooling system is better than water cooling system.