Abstract: In tunnel engineering，the rational selection of support methods and parameters is of vital importance，as it affects the safe production and economic benefits of mines. If the support methods and pa‐ rameters are not reasonably chosen，there will be significant safety hazards. Based on the results of loose ring detection and surrounding rock classification obtained from the on-site investigation of Baixiangshan Iron Mine，the research analyzed the support effect of the existing support methods，and conducted sam‐ pling and tests on site to obtain the mechanical performance parameters of the surrounding rock on site. Based on the existing analysis results of support effects，for roadways of different types and surrounding rock categories，multi-factor coupling orthogonal tests are designed according to four influencing factors: anchor bolt length，diameter，spacing and row spacing. Based on the results of mechanical tests，the parameters of anchor net support were optimized and studied by using FLAC3D numerical simulation software. The results show that in the current support scheme，there is an excess of support in Class II，III and IV surrounding rocks. However，in the support of Class V surrounding rock，there exist situations such as low support effi‐ ciency and insufficient strength. Based on the above research results and taking the classification of sur‐ rounding rock as the standard，a new support scheme was proposed to adjust the current support scheme of Baixiangshan. For the roadways with Class II，III and IV surrounding rock，the support strength can be ap‐ propriately reduced in the subsequent support，while for the roadways with Class V surrounding rock，rein‐forcement is required in the subsequent support. Research can provide references and theoretical basis for the support of mines under similar conditions.

Key words: metal mine, roadway engineering, support optimization, orthogonal test