The watershed management of Miyun County has made significant achievements under the guiding ideology of water resource protection. However, there has still a problem in evaluating the effectiveness of watershed management quantitatively. Based on 1 700 measurements from 41 watersheds, this study estab-lished a quantitative method for evaluating the effectiveness of watershed management through comprehen-sive statistical analysis. The results show that the effectiveness score of watershed management can be calcu-lated by different engineering measures. No obvious difference was found between the actual values and the predicted results, suggesting that the effectiveness of watershed management can be estimated roughly through the engineering measures. The theory of eco-clean watershed meets the needs of watershed manage-ment of Beijing area, and the realization of the theory will bring more water and soil conservation benefits.