An　analytical　solution　for　the　seismic-induced　thrust　and　moment　of　the　circular　tunnel　in　half-space　under　obliquely　incident　P　waves　is　developed　in　this　study,　which　is　the　superposition　of　the　solution　for　deep　tunnels　under　incident　and　reflected　P　waves　and　the　reflected　SV　waves.　To　consider　tangential　contact　stiffness　at　the　ground-tunnel　interface,　a　spring-type　stiffness　coefficient　is　introduced　into　the　force-displacement　relationship.　Moreover,　the　tunnel　lining　is　treated　as　the　thick-wall　cylinder,　providing　more　precise　forecasts　than　beam　or　shell　models　used　in　previous　analytical　solution,　especially　for　tunnels　with　thick　lining.　The　reliability　of　the　proposed　analytical　solution　is　assessed　by　comparing　with　the　dynamic　numerical　results.　Based　on　the　proposed　analytical　solution,　parametrical　studies　are　conducted　to　investigate　the　effect　of　some　critical　factors　on　the　tunnel＇s　seismic　response,　including　the　incident　angles,　the　tangential　contact　stiffness　at　the　ground-tunnel　interface,　and　the　relative　stiffness　between　the　ground　and　the　tunnel.　The　results　demonstrate　that　the　proposed　analytical　solution　performs　well　and　can　be　adopted　to　predict　the　internal　forces　of　circular　tunnels　under　obliquely　incident　P　waves　in　seismic　design.