Analyzing the contents of the traffic information, it classifies traffic information into three types, which are static, dynamic and historic traffic information respectively. Based on the constructions of the traffic information platform in the middle, small cities, integrates the three system run modes(C/S, B/S and Mobile Terminal) of the platform, it pays more attention to design the function components of data processing sub-system and does some research on the key technique. Dynamic information is a ki...