Abstract:There is a large amount of coal under all kinds of water bodies in China. Mining under water bodies is a hot issue in coal mining in China. In this paper, the development height of waterconducting fissure zone has been determined by the method of regulation, analogy and actual measurement, and the feasibility of mining under water body in No.6 mining area of Liyan coal mine has been discussed and analyzed comprehensively. Based on the calculation of the feasibility study in Liyan coal mine, the conditions and evaluation methods for mining under water bodies have been introduced. It will provide some references for safe mining under water body of coal mine in China.