Abstract: Abstract：The large coal pillar width and gas overrun in the upper corner of fully mechanized caving face have seriously affected the coal mining. In order to solve these two problems, taking No. 3205 working face of Yechuan Coal Mine as the research object, the roadside filling technology of gob-side entry retaining was studied by combining theoretical analysis, numerical simulation and field test. The mine pressure monitoring scheme of gob-side entry retaining was established, and the deformation characteristics of roadway surrounding rock and the strength of roadside filling body were analyzed. The results show that the width of filling body is 1.5m and the strength of filling body is 25MPa, which is the optimal choice of filling body parameters. When the working face advances 300m, the maximum deformation of the total height of the roadway is 0.5m, and the maximum deformation of the total width is 0.6m. At this time, the deformation of the roadway is stable, and the roadway operation effect is good, which can meet the requirements of the mine. This study provides a technical reference for mines with similar mining geological conditions and engineering problems.