There are many problems caused by the unreasonable vertical pipeline planning and design in urban underground pipeline projects. This paper centers on improving the level of the vertical planning of complex pipeline, and identifying the reasonable design sequence of complex pipeline on the Blin method which using the principle of fuzzy mathematics. According to the existing method of vertical pipeline design, a model of vertical crossing of various single pipelines in urban intersection is established. Meanwhile, a new method of the vertical planning and design of complex pipeline is put forward. A case design of complex pipeline is carried out with this method to verify the feasibility as well as the effectiveness of it, hoping to provide design ideas for majors in the vertical planning and design of complex pipeline.