A method for river/lake level regulation and a water conservancy system. The method for river/lake level regulation employs a non-closure mode; a water reservoir system (1) is built on one side of a river/lake, water from the river/lake enters into the water reservoir system (1) when the water level of the river/lake exceeds a warning water level, and the river/ lake is replenished with the water stored in the water reservoir system (1) when the water level of the river/lake is unduly low; the water conservancy system, which employs the non-closure mode, is built on one side of a river/lake waterway (01) and comprises the water reservoir system (1) and a first water passage (21), the water reservoir system (1) is communicated with the river/lake waterway (01) through the first water passage (21). The method for river/lake level regulation and the water conservancy system realize river/lake level regulation during drought and flood periods without any river/lake closure, so that water resources are control effectively.
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