To modulate the acid properties of Br?nsted acid sites on zeolites to improve their catalytic performance and prolong the lifetime of catalysts, Zr-doped SAPO-34 (ZrAPSO-xZr) was prepared by hydrothermal method. The bifunctional catalysts ZnZrOz/ZrAPSO-xZr were made by mixing them with ZnZrOz metal oxides at 1:1 mass ratio. The structural composition, microscopic morphology, and surface properties of ZrAPSO-xZr were characterized and tested by XRD, SEM, FTIR, BET, NH3-TPD, and Py-IR. Based on the synthesis of light olefins from syngas [n(H2)/n(CO)=2], the effects of Zr doping amount [x, where n(Al2O3): n(ZrO2)=1.0:x] on the catalytic performance and lifetime of ZnZrOz/ZrAPSO-xZr were investigated. The results demonstrated that the optimum Zr doping amount (x) of ZrAPSO-xZr was 0.1 mol. Zr doping increased the specific surface area of SAPO-34 zeolite (162.29 m2/g) and decreased the density of its Br?nsted acid sites (0.339 μmol/m2), and ZrAPSO-0.1Zr reached 441.88 m2/g and 0.229 μmol/m2. The addition of Zr made a more dispersed distribution of Br?nsted acid sites and prevented carbon accumulation from blocking the zeolite pores. Under the reaction conditions of H2/CO=2/1、400℃、3 MPa and GHSV=3000 mL/(gcat·h), the light olefin selectivity of ZnZrOz/ZrAPSO-0.1Zr only slightly decreased from 81.31% to 76.65% even the reaction time extended to 2400 minutes. ZrAPSO-0.1Zr had more acid sites (1.437 mmol/g) and a larger pore size (9.80 nm), which was favorable for providing sufficient active sites and mass transfer space for light olefins and preventing carbon deposition blocking the channels of zeolites.