In order to improve the informatization level of teaching management in colleges, a system solution based on decision tree and WebService is proposed. Based on the demand analysis and credibility analysis of the teaching management system, this paper puts forward the logical architecture of system and establishes a UML model for the key teaching management process. Then, the improvement of the decision tree algorithm is applied to the core teaching evaluation problem through the bias problem of simplifying the ID3 calculation formula and feature values. The detailed implementation process is provided for the key modules of the system. In the system test and analysis based on J2EE and MSSQL2016, the results show that the scheme can realize the sharing and mutual access of educational resources. Its rapid calculation of information gain and the selection of eigenvalues also meet our expectations and it has the advantages of usability, reliability and efficiency.