With the influence of climate change and human activities,the drought frequency increased.This brought the adverse influence on the local people's life and social production.To determine the drought early-warning water level of main rivers,lakes and reserviors now is more important.This water level will provide the basic evidence for starting drought emergency response when drought takes place in the future.Based on the standard of determing drought limit water level by the national flood control and drought relief headquarters and the Ministry of Water Resources,the drought limit water level of middle stream of Zhangshui River(Nankang urban area reach)which is the first grade tributary in the upstream of Ganjiang River is analyzed.And based on the local actual water utilization amount and inflow,the water level is finally determined.It is reasonable and can meet the demand for daily water utilization.