How a Chinese non-government organization overcome external control from the state and advocacy for its mission under the dual-management system？While previous studies have pointed out NGO can benefit from personal network while bargain with the supervision agent，little research focus on the strategy of how NGO use institutional factors.This paper argues that NGO could get rid of the external control by creating the new institutional link with the government，which provides NGO more opportunities in advocacy.A deep single case study is adopted in this article.The author takes an environmental NGO in H City Z Province as an example to illustrate how the organization develops the relationship with a new supervision agent.This new institutional link helps the NGO reduce its dependence on the previous supervision agent and enhance its autonomy from the state.The changed power structure finally helps NGO expand its space for advocacy.