The effect of property tax reform is mainly reflected in real estate market investment, personal, financial and other aspects of improvement. The evaluation of real estate market is a multi-objective work. In order to scientifically and objectively evaluate the reform effect of property tax in Chongqing, the multi-objective decision making and ideal interval model is introduced. The evaluation index system of real estate market is established by Delphi method, and the real estate market situation before and after the reform of property tax is evaluated by using multi-objective decision making and ideal interval model, and the evaluation results of real estate market are compared. The comprehensive evaluation of the effect of property tax reform in Chongqing is obtained.