Abstract: The support for porous and broken wall rock has been a major technical challenge in construction of highway tunnels.By combining geological engineering conditions and parameters of the cross section layout of Sanlichong highway tunnel,the authors simulated two cased using FLAC: support with Steel Fiber Reinforced Concrete(SFRC) and support with Polypropylene Fiber Reinforced Concrete(PFRC).The stability of the highway tunnel was analyzed for the stresses,displacements and plastic zones.The numerical simulation show that the PFRC structure could work well utilizing the utmost self-bearing capacity of the rock mass and effectively reduce thickness of the 2~(nd) support.