In recent years，as traditional travel agencies have set foot in the OTA market，and OTA has entered the “Internet Plus” sector，large e-commerce companies have rushed to set up tourism App teams. Comprehensive tourism APPs，represented by Ctrip，Fliggy，Mafengwo，Qunar，Tuniu，eLong，TravelGo，Qyer and Lvmama，and related tourism auxiliary App products，have swarmed into the tourism market. With the help of smart phones as the carriers，they have gradually built modularized tourism App products，and formed a sustainable development trend. Based on detailed data and specific cases，this paper makes an in-depth study of the tourism App market intervention in 2018，mainly analyzing the four tourism App categories of reservation，strategy，tools and sharing. In view of the problems existing in tourism App development in 2018，this paper focuses on the present situation and prospect of museum App and smart tourist scenic spot App development，and the impact of WeChat platform on tourism App. The author believes that in the “post-App era”，the “WeChat + tourism App” will become a development trend，and puts forward ideas that can be used for reference.