Vehicle′s positioning and monitoring are more and more popular. However

mass vehicles′ presentation is slow and their coverage rate is smaller than enough. To deal with the issues mentioned above

a mass monitored vehicles′ presentation model is provided based on multilayer grid

and a multilayer grid index is established

to aggregates overlapping vehicles dynamically combined with map scale.This method makes full overlay of monitored vehicles

reduces data transmission and improves the speed of vehicles′ presentation.At last

this model is verified through the application of Key Vehicles Monitoring System in Guangdong Province.