Abstract: In order to research the forces in anchorage zone of the large cross section coal roadway under the effect of compound truss cable, basing on the prestress theory and neutral axis theory ,the advantages about compound truss cable in Xinyuan colliery west roadway are analysised with the help of FLAC numerical simulation software. The results show that prestress F decreases when the distance between compound truss cable and anchorage point x increases. Compared with ordinary bolt, cable support, the neutral axis of support system with prestress compound truss cable support is moved down, the scope of the tension zone is reduced, and the displacement roof and floor measured by FLAC simulation is reduced about 8%.