The current waterway terrain model has basically finalized as using GPS to determine the plane position at the bottom. Using the sounding analyzer to measure the water depth, attached to the instantaneous tide levels or water level materials can obtain the point elevation. With the continuous running all over satellite positioning services system to put into operation, this paper put forward a no tidal mode of waterway terrain measurement model that did not determine tide levels or water level and directly used HBCORS RTK measurement technology to obtain the altitude of water bottom. Through the real project, this article compared the accaracy between the no tidal model with the traditional mode, obtained the accuracy and efficiency of this method were greatly improved. It was valuable to extend and apply.