Abstract: Skarn has a strong hydraulic property.When skarn meets water，its mechanical properties change greatly，thus bringing adverse effect on the mine safety production.The numerical simulation of different tunnel support in skarn rocks for a iron mine is made by using numerical simulation software to explore the tunnel deformation and the variety of safety coefficient.Especially the shotcrete and bolt connecting chain support is introduced.Comparing and analyzing the numerical simulation data，it concludes that the shotcrete and bolt connecting chain supporting is the most favorable way to keep the stability of the tunnel.

Key words: Skarn, Numerical simulation, Tunnel support, Bolt connecting chain