Abstract: In order to reduce the measurement error of transmission line crossing distance and reduce the

occurrence rate of transmission line accidents，a method of transmission line crossing distance measurement based

on grid information model was proposed. The platform of crossing distance measurement including data acquisition

unit，transmission network and measurement unit was designed. The data of transmission and transformation

engineering phases was obtained by grid information model in the data acquisition unit，the data of the lines to be

measured was extracted from the basic database of the grid information model by the measurement unit，the

catenary model and the three-dimensional spatial model were created to realize the transmission line crossing

distance measurement. The experimental results show that the proposed method has a high application value and

feasibility for the information acquisition of transmission line crossing distance with short time and high precision.

      Key words: grid information mode（l GIM）；transmission line；catenary model；line crossing model；crossing；distance measurement