Before accurately evaluating the current situation of a regional road network's guide sign system, we should first investigate its current situation and collect relevant data. Then, aiming at the existing problems, the paper constructed an evaluation structure model. The criterion layer of the model consisted of three main factors, such as correct selection of information, non-interference of information and continuous information, while the scheme layer of the model made up by ten small indicators. Then, the method of AHP was used to match the corresponding weights of each index, and so we can calculate the score of the road network-level guide sign system, and evaluate its current situation. Based on the evaluation results, the paper further evaluated the strength of the revamping. Indicator sign system of single road can also be evaluated with the same method, and evaluation results of road level may guide its construction and transformation. The reliability and applicability of the evaluation index system were verified by the case study of Huangpu District, which proved that the evaluation system can make a scientific and reasonable evaluation. AHP is widely used in engineering, industry, management, commerce and other industries. However, there are not many studies on the evaluation of guiding sign system, so the study has a certain foresight and reference.