The navigable water level is the main technology parameter of engineering and an important factor affecting the project cost.The Inland Navigation Standard clearly stipulates that for the comprehensive channels and canals should with locks，the channel’s navigable water level shall be determined based on a set up a comprehensive analysis.Based on the analysis of Xiaoqinghe channel hydrological condition，and considering the function of flood discharge and drainage，and combining with the actual situation of the waterway and rapids，we determine the navigable water level.