Longmen Grottoes is the famous cultural heritage. Many factors should be considered in reinforcement project of the plank way cantilever beam. Considering the characteristics of the tourist area, many reinforcement schemes are put forward. At last, the methods with CFRP sheet is selected to reinforce the plank way cantilever beam. The reinforcement effect shows that the method with CFRP material increases very little weight of the structural members. The appearance of the reinforced member is harmonious to the surrounding environment.