Developing　ternary　metal　oxides　as　electron　transport　layers　(ETLs)　for　perovskite　solar　cells　is　a　great　challenge　in　the　field　of　third-generation　photovoltaics.　In　this　study,　a　highly　mesoporous　Zn2Ti3O8　(m-ZTO)　scaffold　is　synthesized　by　ion-exchange　method　and　used　as　ETL　for　the　fabrication　of　methyl　ammonium　lead　halide　(CH3NH3PbI3)　perovskite　solar　cells.　The　optimized　devices　exhibit　17.21%　power　conversion　efficiency　(PCE)　with　an　open　circuit　voltage　(V-oc)　of　1.02V,　short-circuit　current　density　(J(sc))　of　21.97mAcm(-2)　and　fill　factor　(FF)　of　0.77　under　AM1.5G　sunlight　(100mWcm(-2)).　The　PCE　is　significantly　higher　than　that　based　on　mesoporous　ST01　(m-ST01;　10nm　TiO2　powder)　layer　(eta　=　14.93%),　which　is　ascribed　to　the　deeper　conductive　band　of　ZTO　nanoparticles,　better　light　absorption　and　smaller　charge　recombination.　The　devices　stored　for　100days　at　ambient　temperature　with　humidity　of　10%　showed　excellent　stability　with　only　12%　reduction　of　the　PCE.　The　charge　transmission　kinetic　and　long-term　stability　parameters　of　the　ZTO-based　perovskite　film　growth　are　discussed　as　well.