The invention relates to a GIS-based traffic distribution display method and a GIS-based traffic distribution display system. The method comprises the following steps: S1, establishing a summary table of base station-based traffic data in a set area; S2, ordering all the traffic data according to the latitude and longitude of a base station and the summary table, and constructing a two-dimensional network model according to set grid accuracy; and S3, drawing grids according to the two-dimensional network model and displaying the grids on a GIS map. The method and the system of the invention can directly count, analyze and display traffic and have the advantage of high performance.