Abstract: Low Impact Development type's Best Management Practices (LID-BMPs) have been regarded as cost-effective measures for mitigating urban runoff impacts. However, as the implementations of LID-BMPs are interacted with many factors, the research on LID-BMPs planning is still lag behind expectations. Based on the survey of LID-BMPs research and practices, a novel method for LID-BMPs planning is proposed to meet the needs of LID-BMPs implementations to China. A college campus in the Foshan city of China is chosen as a case study site to test the proposed method. Four planning scenarios for the college development are proposed, which are the natural condition before development, the existing campus development plan without LID BMPs, a least-cost LID BMPs implementation scenario (i.e., scenario 1) and a maximized LID BMPs performance scenario (i.e., scenario 2). System for Urban Stormwater Treatment and Analysis Integration (SUSTAIN) is a decision-support GIS tool developed by the U.S. Environmental Protection Agency for strategically placing BMPs in urban watersheds. SUSTAIN is used in this study to support the scenario optimization. The scenarios analysis emphasizes on the effects of runoff quantity (runoff volume and peak flow) and quality (SS, COD, TN, TP) controls. The scenario optimization uses the reduction rate of annual runoff volume as the objective. Scenario 1 and scenario 2 are further optimized by SUSTAIN, and the best cost-effective scenario is obtained.