This paper studies how to generate the real 3D model with high degree of fineness and high positional accuracy in areas covered by a wide range of waters（especially including strip-shaped features which surrounded by water on three sides such as breakwaters or LNG mole），which takes the application of oblique photogrammetry technology in port engineering as an example，systematically summarizes the technological process of the application of this technology，and calculates the accuracy of the real 3D model which created from the process，which shows the high-accuracy effect that the accuracy of flat surface and elevation are better than two pixel size.This paper verifies the feasibility of the technical process and the reliability of the accuracy of the generated real 3D model，which can provide reference for similar projects.