Abstract: In order to solve the problem of large area pressurizing accident of hydraulic support in fully mechanized caving faces, the paper analyzes the cases of pressurizing support in fully mechanized caving face of Tashan Coal Mine, and it is suggested that the geological factors, the working condition of the supports and the management of the work face are the main reasons for pressurizing support accidents. Through analyzing the causes of pressurizing support, from designating warning scope of pressurizing support before mining, taking reasonable mining height, strengthening field management, improving the quality of support, mine pressure warning, draining abscission layer water, reasonable support resistance selection and other methods, the prevention and control work for pressurizing support is carried out.