SnS　is　a　non-toxic,　low-cost　material　and　becomes　one　of　the　most　promising　absorber　materials　in　thin　film　solar　cells　for　the　high　absorption　coefficient　and　near-optimal　bandgap.　However,　the　reported　efficiencies　of　SnS　devices　are　low.　the　numerical　simulation　of　SnS　thin　film　solar　cells　equipped　with　TiO2　buffer　layer　was　investigated　in　this　paper.Firstly,　the　cell　parameters　such　as　thickness　and　doping　concentration　of　absorber　layer　and　buffer　layer　were　discussed.　After　optimization,　the　maximum　power　conversion　efficiency　of　15.66%　has　been　reached.　Then,　the　effect　of　working　temperature　and　back　contact　metal　work　function　on　the　performance　parameters　of　SnS　based　solar　cell　was　studied.　The　simulation　results　show　that　the　temperature　coefficient　of　the　conversion　efficiency　is　-0.029%/K.　When　the　back　contact　metal　work　function　is　larger　than　5.1　eV,　the　cell　performance　is　better.　All　these　simulations　provide　theoretical　guidance　for　the　research　and　development　of　SnS　thin　film　solar　cell　with　highly　efficient　energy　harvesting.　©　2022,　Editorial　Office　of　«Res.　Prog.　SSE».　All　right　reserved.