Abstract: In order to solve the problem of a large number of damage to the supporting structure in the production process，Zhongguan Iron Mine found that the main reason for the damage is unreasonable sup⁃ port form through the analysis of the whole process of supporting site selection and construction trial. Through the research on the characteristics of rigid support and flexible support，combined with the failure characteristics of each support section of the main chute，the support scheme is optimized and adjusted. The square steel is used instead of the rail，and the reinforced concrete and steel fiber concrete are combined with the manganese steel plate method of the anchor rod deep into the bedrock to increase the anti-crushing and wear-resisting characteristics of the rigid support. At the same time，the flexible support such as the buf⁃ fer platform and the buffer chamber is added at the bottom of the unloading pit and the strong impact point to solve the impact failure. The main chute has been in normal operation for 3 a，and the supporting structure has not been destroyed，which has achieved good practical results.

Key words: main chute, rigid support, flexible support