Traffic guide is a very important service for society. Current guide system is poor efficiency and complexly in operation. This made traffic guide information can’t be published regularly and in time. It also reduced down expressway net’s ability of providing traffic guide information for society. Regard CMS on expressway net as objective, after sorting and concluding guide information by scene analysis, the paper suggests a systematic method of processing traffic guide information based on dynamic traffic information automatic and prove it by an application. It can send detour information to each piece of CMS on expressway net quickly without redundant information. Traffic guide level on province expressway net would be improved extremely.