Vehicular ad hoc networks(VANets) experiment system is studied.Configuration,characteristics and research fields of VANets are introduced briefly.According to the characteristics of VANets,key modules that multi-vehicle ad hoc experiment system needs are designed,and each module’s function and practice requirement is analyzed.The reliability of experiment system is tested primarily using three experiment scenes of multi-vehicle ad hoc network,car following and wireless positioning.The experiment result shows that multi-vehicle ad hoc experiment system has the capability of the correlated experiment of VANets. Vehicular ad hoc networks (VANets) experiment system is studied. Configuration, characteristics and research fields of VANets are described briefly. According to the characteristics of VANets, key modules that are multi-vehicle ad hoc experiment system needs are designed, and each module’s function and practice requirement is analyzed. reliability of experiment system is unsupported using three experimental scenes of multi-vehicle ad hoc network, car following and wireless positioning. the experiment result shows that multi-vehicle ad hoc experiment system has the capability of the relevant experiment of VANets.