Abstract: According to the important role of the emulsion liquid to the hydraulic powered support system, taking the Xiegou Mine of Xishan Jinxing Energy Corpora tion Ltd.as an example, a site experiment was individually conducted on the mixing ratio concentration, water sampling of the mixing liquid, thermal stability and others of the emulsion liquid for No.18105 fully mechanized coal mining face.A detail analysis was conducted on the experiment data obtained.There were four dangers occurr ed by the concentration too lower of the emulsion liquid summarized.There were three technical measures provided to improve the concentration of the emulsion liquid, which could provide the references to the selection and maintenance of the hydraulic powered support and emulsion liquid in the mine site.