In this paper,the authors put forward a kind of data structure of section analysis for urban underground pipes,and designed a type of arithmetic for getting points of intersection of the section.The authors put forth the section visualization technology and given an example to application.For a transect analysis,geographical coordinate value of X multiplied by cos θ is X-axis.Y-axis is Z-axis of geographical coordinate.For a vertical section analysis,X-axis is X-axis of geographical coordinate,and Y-axis is Z-axis of geographical coordinate.3D distance or horizontal distance can get from a sectional view.Moreover it is important that a sectional view is clear to visualize kinds of underground pipes.