The quality of preschool education has great influences on an individual, family, and socity. In order to ensure the quality of preschool, each nation in the world has the gradual trend of extending the compulsory education to kindergarten education. To conform to this trend, the relevant educational systems should have adequate planning. In the process of planning, the future student number of kindergarten is a important referecntial index. This study applies the time series analysis to forecast the future student of kindergarten which provides the reference of educational planning.