To explore the reasonable size of inclined trapezoidal gob side entry pillar in gently inclined coal seams and the control technology of roadway surrounding rock, taking the 72510N working face as the engineering background, the internal and external stress field theory, numerical simulation and field test considering the coal seam dip angle are applied to carry out research. Through theoretical calculation, we determined that the width of the stress field in the 72510N working face is 13.4 m, and the coal pillar reasonable width should not be greater than 8.4 m. Combined with the simulation calculation results, the coal pillar width was determined to be 7 m. On the basis of analyzing the difficulties in controlling the deformation of surrounding rock of inclined trapezoidal gob side entry in gently inclined coal seams, combined with the research results, it is pointed out that asymmetric support is used to control the surrounding rock. The support mode is "high-strength anchor bolt+roof high-strength long anchor cable+pillar side inclined anchor cable+anchor mesh", which has been applied in the field. The field test results show that the large deformation of surrounding rock of roadway along goaf can be effectively controlled by setting a coal pillar size of 7 m and using asymmetric support technology. The measured maximum displacements of the right middle roof, the left middle roof, the coal pillar, the solid coal and the floor measuring points during tunneling are 121, 105, 96, 90 and 82 mm respectively, and the maximum displacements observed during mining are 389, 363, 346, 335 and 325 mm respectively, meeting the on-site production needs.