Abstract: In order to solve the serious problem of surrounding rock deformation of dynamic pressure roadway with multiple roadway layout and filling entry retaining in Xinyuan Coal Mine, based on the field monitoring characteristics of roadway surface displacement change, leading supporting stress change law and numerical simulation of roadway plastic zone change law, and according to the deficiency of the original supporting form, the support optimization scheme suitable for large deformation of multi-roadway roadway is proposed, and the industrial test of optimized reinforcing support is carried out in underground. The measured results show that the surrounding rock starts to deform after it enters the influence area of abutment pressure, but the deformation amount is not large; after the original support scheme was applied in working face, the floor heave of the roadway increased sharply. According to the field observation and numerical simulation analysis of the change law of the plastic zone, both the roof and the two sides of the reinforcement measures after the optimization of support were reduced, and the floor heave was reduced by about 50%. The optimization of the reinforcement scheme improved the quality of the roadway surrounding rock.