Researches in reservoir operation rules had already been studied more than half a century but much still remains to be done. Besides, as a result of global climate change and many nature or human causes, make the frequency and intensity of a lot of hydrological events such as drought and flood change, the existing reservoir operation rules need to change. This paper aims at reservoir operation rule-curves in detail, and applies to the newly rising evolution algorithms to optimize reservoir operation systematically. Furthermore, the study detects the drought events by the prediction data and water resource system model, optimizes the double-group rule-curves and makes the water resources more effectively. The LiYuTan reservoir in Taiwan, for example, establish, the up-to-date operation rule.