To provide an operation plan creation support system of a connection water system, with which a suitable operation plan of a plurality of dams and power plants can easily be created by manual calculation.

The operation plan creation support system of the connection water system is provided with a first display device displaying a power generation operation plan of a plurality of power plants or a discharge plan of the dams, a second display device displaying plan water levels of a plurality of dams and a computer performing an operation based on data inputted from an input means and a stored data base. In a plan on the day of the power plants and the dams, a power generation output and a discharge amount after present time in a temporary plan on the day are inputted from the input means and the power generation output, discharge amount and water level by present time and temporary plan water levels on the day are calculated. The water levels of a plurality of dams are classified and displayed as a result water level, a plan water level and a temporary plan water level. In next day plans of the power plants and dams, the power generation output, discharge amount and an initial water level of a next day temporary plan are inputted, the next day temporary plan water levels are calculated and the water levels of a plurality of dams are classified and displayed as the plan water level and the temporary plan water level.

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