To　optimize　road　tunnel　excavation　and　support　design,　by　considering　road　tunnel　excavation　as　single　bore　in　the　elastic　infinite　plate　and　introducing　conformal　mapping　and　Cauchy　integral,　complex　variable　function　solutions　were　applied　to　deduce　the　stress　and　displacement　distributions　along　the　tunnel　perimeter　with　arbitrary　cross　section,　which　was　subjected　to　the　non-uniform　far-field　stresses　and　the　supporting　pressure.　The　solutions　were　implemented　in　the　platform　of　MATLAB.　Then　detailed　case　studies　were　carried　out　to　discuss　the　influences　of　cavity　shape　of　tunnel,　cavern　span,　lateral　pressure　coefficient　and　supporting　pressure　on　the　stress　and　displacement　distribution　along　tunnel　perimeter.　The　results　show　that　cavity　shape　of　tunnel　influences　significantly　the　stress　and　displacement　distributions　within　the　surrounding　rock　mass　of　cavern.　Increasing　tunnel　span　will　significantly　enlarge　the　crown　subsidence,　invert　upheaval　and　sidewall　convergence　after　tunnel　excavation,　which　makes　the　stress　distribution　and　change　within　surrounding　rock　more　complex.　It　is　more　appropriate　to　utilize　the　top-heading　excavation　method　for　the　ground　condition　with　higher　horizontal　in-situ　stress.　©,　2015,　Xi＇an　Highway　University.　All　right　reserved.