The　modified　stress　method　is　adopted　in　this　paper　to　consider　the　effect　of　anisotropy　on　soil　strength.　This　method　introduces　the　fabric　tensor　to　adjust　the　relative　magnitudes　of　stress　components　in　different　directions,　so　that　anisotropic　soil　can　be　equivalent　to　isotropic　soil　in　the　modified　stress　space.　By　substituting　the　modified　stress　tensor　for　the　ordinary　stress　tensor,　the　Mohr-Coulomb　strength　criterion　can　be　developed　to　be　cross-anisotropic.　The　form　of　the　criterion　remains　unchanged,　while　strength　parameters　are　still　constant　and　independent　of　the　loading　direction.　This　paper　compares　the　relation　curves　between　the　internal　friction　angle　and　the　loading　direction　according　to　three　different　modified　stress　formulas　and　analyzes　the　effect　of　fabric　on　the　variation　of　the　internal　friction　angle.　Continuous　and　regular　failure　envelops　are　drawn　in　the　deviatoric　plane.　Meanwhile,　triaxial　compression　and　true　triaxial　test　results　of　different　anisotropic　geomaterials　are　predicted.　Finally,　the　cross-anisotropic　Mohr-Coulomb　criterion　is　used　to　calculate　the　passive　earth　pressure　on　the　retaining　wall　in　the　horizontally　sedimentary　stratum.　The　obtained　expression　is　simple　and　explicit,　which　verifies　the　practicability　of　the　modified　stress　method.　©　2019,　Science　Press.　All　right　reserved.