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