Aiming at the problems of current single-line diagrams of pressure pipelines,such as the inability to accurately provide the relevant positions between pipelines and the inability to eliminate the effect of gross errors on coordinate system conversion,a new method for drawing pressure pipelines was proposed based on the transformation of spatial rectangular coordinate system to reduces the frequency of matrix parameters transformation and utilize the reliable data fully.The robust estimation was used to reduce the influence of the coarse error of individual common points on the coordinate conversion parameters.The feasibility and effectiveness of the proposed method were verified by using the data from simulation points.This method has engineering application value.