With the development of the transportation, the county-country highway network has the more and more important function in the transportation network. Therefore, it is necessary to establish the scientific method evaluating the total function of the county country road network, so as to support decision for the synthetically transportation planning and management. The paper evaluates the whole construction level, layout quality and total capacity of the county-country highway network from the standpoint of holistic planning and synthetically transportation development. The status of the existent network is investigated and analyzed. Then the corresponding evaluating guideline system and method is put forward. Applying the proposed system and method, the paper analyzes the performance of some county highway network in Nanchong city and brings forward some improvement suggestions.