The National Eleventh Five-Year Plan for National Economic and Social Development of China clearly points out that China will vigorously develop coal chemical industry, promote in-depth processing and utilization of coal, develop circular economy, conserve resource, promote clean production and reduce the impact of development on environment and ecology. This paper firstly discussed the trinity strategy of "Coal mining – Coal chemical industry – Coal chemical industry equipment manufacturing" , then discussed the strategic meaning, feasibility and economic benefit of the trinity strategy,finally proposed a kind of circular economy development mode of coal chemical industry park, including the implementation steps of trinity strategy, the operation and management mode of implementing circular economic industry park.