In allusion to the large variant after supporting in the return gateway of 21108 in Shan Jiaoshu Mine, according to the design idea of coupling support, the existing supporting parameters were improved, the reasonable supporting proposal was gotten, which based on the coupling support technology, and the optimum proposal was contrast with the primary proposal through numerical simulation. The consequence indicate that not only designing method of coupling support is in favor of surrounding stable, but also this method improve the carrying capacity of surrounding rock, and the optimum proposal is better than the primary proposal ,and the optimum proposal effectively control the variant of surrounding rock.