Abstract: Environmental education (EE) is an important means of urban green space management to promote harmonious coexistence between man and nature. The evaluation of its efficacy is an effective way to improve the management level of EE. Exploring the study and application is of positive significance to understand the urban green space EE mechanism, reach more credible evaluation findings, and put forward basis for more reliable measures. This paper sorts out the evaluation methods in the studies of EE efficacy of urban green space at home and abroad under the document research method. It separates the development process of EE efficacy evaluation methods into three stages, and makes a comparative analysis. It sums up and concludes that the evaluation methods in practical research have shown the trend of integration and systematization, and the evaluation conclusions have also been significantly improved in reliability and validity from the past. On this basis, this paper introduces two new practical methods that have emerged in recent years: one is to evaluate the efficacy of EE through the establishment of an evaluation index system; the other is to explore the relationship between the elements of environmental education and the overall efficacy of the EE through introducing the structural equation. The studies that apply the two methods have proved that environmental education measures with clear targets could indeed leave a positive impact on the educatees of the urban green space.