Considering　the　sequence　of　two-tunnel　excavation,　converting　the　underground　space　of　tunnel　to　the　case　of　elastic　half-space　under　plane　strain,　an　analytical　solution　is　presented　for　stress　and　displacement　of　twin-tunnels　with　arbitrarily　shape　and　size　using　analytic　continuation　method　and　Schwarz　alternating　method　in　an　elastic　half-plane.　Because　the　depth　is　larger　than　the　size　of　the　tunnel,　thus　the　effect　of　gravity　gradient　is　ignored,　and　gravity　loads　are　simplified　as　uniform　normal　loads　along　far-field　boundary.　As　a　special　case,　a　close　solution　for　stress　and　displacement　field　around　circular　twin-tunnels　at　great　depth　considering　the　influences　of　lining　forces　of　tunnels　is　given.　Circular　twin-tunnels　are　subjected　to　uniform　internal　pressure　and　their　construction　sequences　are　properly　taken　into　consideration.　Comparison　between　the　results　of　numerical　analysis　by　two-dimensional　finite　element　method　and　those　from　the　closed　solutions　indicates　that　the　closed　solution　is　reliable　and　applicable　for　the　stress　and　displacement　field　around　the　twin-tunnels　at　great　depth.