Abstract: In order to provide valuable reference for deep roadway excavating through large fault tectonic area，geo-stress was tested by trepanning stress relief method.Taking measured geo-stresses as initial condition，3-d finite difference numerical simulation mode was set up.Elaborate geo-stress field of this area was obtained by 3-d regression method.Results showed that regressed geo-stress filed was fit for that from actual test，maximum error was only about 14.31%.At pre-excavate roadway location(buried depth was 800m)，inner stress of large fault weakened，whose stress difference from stress-concentrated fault boundary was 3.0MPa.This made fault vicinity become stress active zone，that was，cracks development zone.Direction of horizontal principal stress deviated 3.5°in stress active zone，which largely changed rock stress state and added rock damage possibility influenced by mining.Therefore，reinforcing roadway supporting in stress active zone was necessary.