Abstract: The optimization of roadway support parameters not only considers the stability of the surrounding rock，but also the economic costs.There is no clear relationship between the supporting parameters and the stability of surrounding rock and the economic cost.Therefore，it is difficult to determine specific support parameters when ensuring the stability of the surrounding rock and lowering costs.The vertical displacement and horizontal displacement of the roadway surrounding rock are obtained by using FLAC3D numerical simulation software in the orthogonal experiment.The primary and secondary influencing order of the supporting parameters and the optimal level combination were obtained respectively by the range analysis and the comprehensive weighted scoring method.The results show that the primary and secondary order of the supporting parameters influencing the surrounding rock and costs are the thickness of the spray concrete(factor D)，the diameter of the bolt(factor C)，the length of the bolt(factor B)，and the spacing of the bolt(factor A)，and A₄B₁C₂D₃ is the best one.The optimal support parameters that were obtained by ground pressure monitoring at wind tunnel can effectively ensure the stability of surrounding rock，and can save 1 875 yuan for each 5 m gateway.These provide the important reference basis for roadway support.

Key words: Supporting parameter, Optimization, Economic costs, Orthogonal experiment, Optimal level