Abstract:  In the preliminary design phase of long distance transmission line,The traditional way of investigation revealed many shortcomings and limitations,With GPS navigation and positioning technology、Information software、wireless communication、The rapid development of mobile terminals and other hightech,The emergence of navigation electronic map has solved this practical problem. This paper briefly introduces the development status and advantages and disadvantages of domestic navigation electronic map,Orville focuses on the interactive map in practical engineering survey coordinate transformation and CAD chart of industry function.Last show,The use of navigation electronic map industry function can greatly improve the working efficiency of survey line selection,Can greatly improve the working efficiency of the survey line selection technology,Improve the rationality of line design, To reduce the cost and workload of field reconnaissance,Shorten design period。