Regional development plan is the basis of water demand prediction.The balance analysis of supply and demand of water resources is an important mean to test whether the regional development planning is feasible .Based on the development and utilization plan of water resources and social economy development planning in Songming county, the paper analyzed water supply, water demand,and water supply and demand balance. The results show that water demand presents a trend of increase,but water consume shows a trend of decrease;according to the calculation of new water demand in flat water year,the amount of water demand is slightly more than the amount of water supply in 2012 and 2030.However, the amount of water demand is less than the amount of water supply in 2020 and 2025,but in accordance with P=75% required to calculate new water demand, every level year has different degrees short of water resources;water consumption is less than water supply in each year which indicates the amount of water supply is completely capable of supporting the scale and level of social economy development planning under the full consideration of the secondary utilization of water resources. In the implementation of planning water-use efficiency, the social economy development planning is adaptable to the utilization of water resources planning in Songming county.