This paper preprocesses the employment information of the graduates from a secondary college in Fujian Province in 2016, with the research carried out from the statistical analysis and decision tree model construction. The decision tree is to be constructed by using C4.5 (J48) algorithm in Weka. Based on the analysis and construction of the decision tree model, this paper puts forward relevant suggestions from personnel training scheme, reward system and employment planning of students in colleges, thus providing certain decision-making help for employment guidance departments and college leaders.