The invention provides a system for providing a real-time road condition service of a road. According to the system, a road link state changing continuously is stored into an internal storage unit of the system and is cut into map cutting pieces at different levels for caching. Therefore, a defect that the road condition can not be displayed timely in the prior art can be overcome and thus the requirement of real-time displaying of the road condition can be met; and the requirement of the GIS server performance is reduced.