大型管道输水工程的特点是距离长、流量大、管径大，存在一些特殊的水力学问题，本文提出这些问题并进行了初步研究，研究认为，对于管道糙率的选取问题，不宜采用某一定值，而应综合分析各种因素，采用一定糙率范围设计管道；长管路分段设减压池和延长闸、阀关闭时间是降低管道压力的有效措施；事故检修期供水问题可通过管道本身调整运行方式解决。 Large-scale pipeline project is characterized by long distance, large flow, large diameter, there are some special hydraulics problems, the paper put forward these issues and conducted a preliminary study, the study believes that the selection of pipe roughness, should not be used A certain value, but should be a comprehensive analysis of various factors, the design of a certain range of roughness pipe; long pipeline sub-decompression pool and extension gate, valve closing time is to reduce pipeline pressure effective measures; accident maintenance water supply problem can be passed Pipeline itself to adjust the operation mode to solve.