Mobile Internet era makes the position of traditional internet appliance replaced by mobile internet. And with the increase of users’ requirements for real-time and intelligence to tourism services, tourism industry ushered in a new challenge. This paper counts the mainstream mobile application client related intelligence tourism, identifies their problems, analyses the main cause of the current small coverage and poor functions of intelligence tourism application client and proposes the application of ontology theory in the research of intelligence tourism mobile application client. Also, many advantages of ontology in solving these practical problems are summarized. It has significant value for the development of intelligence tourism in mobile internet.