IntroductionWith the rapid development of mobile communication technology and the growing popularity of intelligent terminals, there is an urgent need to get information and services from the Internet at anytime and anywhere even during movement. The urgent needs of information and services promoted the convergence of Internet technology and mobile communication technology, and finally formed the Mobile Internet. Among the wide variety of Mobile Internet services, location-based services (LBS) are the most widely used one. It can provide many personalized services for mobile users according to their location information. Users can not only access to basic geography-related services, but also achieve communication, purchasing and sharing based on social network, as well as get news, arrange dating, release and search information during movement [1].In the era of Mobile Internet, cell-phone is much more than a tool for communication; it has already become an "organ" of our body, and has even become an indispensable part of people's social relationships. However, the high adhesion degree of mobile terminals to users not only brings facility but also bring new security risks. Physical location and trajectory data of mobile user contains a large number of personal privacy information. If the specific location information of user has been leaked while using the LBS services, it may disclosure some privacy information of user, such as interests, habits, health status, political affiliation, even cause huge loss of personal property and security.The paper started from the application perspective of mobile cloud computing, analyzed the advantages and necessity to provide LBS services based on mobile cloud computing, introduced the traditional protection methods of location privacy and pointed out the new security risks to LBS system brought by mobile cloud computing. In order to solve the above problems, the paper proposed a systematic framework of LBS system and described the realization process of LBS business based on mobile cloud computing.