With the rapid development of mobile internet, the country vigorously promotes the informationization of vocational education, and the new educational means based on information technology have become the direction of development. Based on ADDIE model, the author conducts a questionnaire survey and data analysis on the teaching mode of vocational schools. According to the needs analysis, this paper puts forward the functional modules and background system design scheme of APP system in vocational schools, and puts forward some suggestions on the system development platform and the package of APP system, to build "Internet + education" supporting service platform for vocational schools, and to promote the deep integration of information technology and curriculum teaching.