In the liquid supply system of fully mechanized working face,because the pressure loss of pipeline system has a great influence on the stability and rapidity of the hydraulic support action,the pressure loss can not be ignored,it should strive to adopt a liquid supply method with less pressure loss.Theoretical calculation and Simulation X software were used to analyze the pressure loss of pipeline system under different liquid supply modes and the data collected on site.The results show that the theoretical calculation results are consistent with the Simulation X results and field data in the variation trend of pressure loss of liquid supply pipeline,the pressure loss of trapezoidal liquid supply mode is small is verified,its value is about 5.0 MPa,and the pressure loss between the first support and the last support is about 1.0 MPa.Trapezoidal liquid supply mode is the most suitable liquid supply mode for the current fully mechanized working face.