Abstract: During the excavation of 3203 transport channel of Yangcheng Sihou Coal Industry Co.， Ltd.，due to the influence of nearby goaf，small kiln failure area and geological structure，the roadway is driven to the high stress area in the section 410~490 m，and the stress phenomena such as two-side cav⁃ ing and roof subsidence and caving appear. From the coal seam occurrence，concentrated stress and sup⁃ porting structure，the crushing mechanism of surrounding rock in high stress area is analyzed，and the sur⁃ rounding rock support is optimized，and the combined support technology of "flexible grouting + truss an⁃ chor cable + trapezoidal steel shed + shotcrete" is proposed. The practical application results show that af⁃ ter adopting the combined support technology，the maximum roof subsidence is 0.14 m，the caving depth of the two walls is reduced to 0.6 m，the length of the slab is reduced to 1.7 m，the convergence of the two walls is reduced to 0.37 m，and the tunneling speed is increased to 5.4 m/d，which has achieved remark⁃ able application results.

Key words: full coal roadway, high stress zone, rock fragmentation mechanism, support optimization