Abstract: In addressing the instability of roadway with great mining-heigh,a large cross-section hexagonal roadway was proposed to improve the stress distribution in the surrounding rock based on the relationship between roadway cross-sectional shape and surrounding rock stability.Taking the geological mining conditions of the No.3 coal seam in Wulihou Mine as the engineering background,the stress distribution patterns around 4 types of hexagonal roadways were compared and analyzed using the theory of complex functions in elastic mechanics.The results indicated that the hexagonal roadway with a height to width ratio of 0.8 and a slope angle of 60°(working condition 1) showed the most even stress distribution and the minimal stress concentration.The minimum bedding dip angle for the surrounding rock plastic zone was 60° in this case,and the working condition 1 was therefore the optimal roadway section.The stress concentration degree increased with the mining depth and lateral pressure coefficient.The higher the vibration speed,the more pronounced the concentration of dynamic stress,and the superposition of dynamic and static stress significantly increased the risk of roadway instability.A metal support suitable for the mechanical characteristics of hexagonal roadway was designed based on the above analysis.The strength validation was conducted and the results indicated that the support design can meet the engineering requirments.