In　order　to　study　the　evolution　law　of　tunnel　convergence　deformation　during　the　construction　of　shallow　buried　unsymmetrical　pressure　tunnel,　the　deformation　characteristics　and　evolution　law　of　shallow　buried　unsymmetrical　pressure　tunnel　during　the　three-step　construction　method　are　studied　based　on　the　background　of　Qingshui　No.　2　tunnel　project　and　numerical　simulation.　The　results　show　that:　with　the　tunneling,　when　the　tunneling　depth　is　less　than　40m,　the　settlement　deformation　gradually　decreases,　and　the　maximum　settlement　is　at　the　entrance;　When　the　tunnel　footage　is　greater　than　40m,　the　settlement　deformation　first　increases　and　then　decreases.　The　maximum　settlement　of　the　arch　crown　is　15m　in　front　of　the　tunnel　face,　while　the　maximum　settlement　of　the　arch　shoulder　is　20m　in　front　of　the　tunnel　face;　The　maximum　value　of　arch　waist　convergence　appears　at　10m　in　front　of　the　tunnel;　The　effective　combination　of　numerical　simulation　and　monitoring　technology　can　provide　guidance　for　engineering　practice.　©　Published　under　licence　by　IOP　Publishing　Ltd.