With the trend of growing popularity of the use of mobile network and mobile devices, upgrading the elementary school's information system and developing mobile applications for parents and teaching staff to use with the mobile devices is an convenience. This research aims at depicting a flow process, for developing an application of an elementary school. Co-operating with Yu-Cai Elementary School, this research tries to establish a development model of mobile applications with the integration of elementary school's information system. The research includes the comparision of development models, data transfer infrastructure and the development infrastructure of mobile applications, so as to provide a reference for the future developers when developing mobile applications for elementary schools.