Abstract: Ce_0.8Cu_0.2O₂ oxygen carrier has excellent performance in chemical-looping reforming of methane coupled with CO₂ reduction technology. Different mass of S-1 molecular sieve was added to Ce_0.8Cu_0.2O₂ oxygen carrier. The physicochemical properties and reactivity of the carrier were characterized by XRD, BET, XPS, SEM, TEM and CH₄-TPR & CO₂-TPO. The effect of S-1 molecular sieve on the performance of Ce_0.8Cu_0.2O₂ oxygen carrier in chemical-looping reforming of methane coupled with CO₂ reduction was systematically investigated. Compared with Ce_0.8Cu_0.2O₂ oxygen carrier alone, the specific surface area of the composite oxygen carrier increased from 15.44 to 73.27 m²/g after adding 0.3 g S-1 molecular sieve. At the same time, its thermal stability and structural stability were greatly improved. The CH₄ conversion rate of composite oxygen carrier with 0.3 g S-1 molecular sieve increased from 38.93% to 56.03%, and the CO yield increased from 1.18 to 2.16 mmol/g during CO₂ reduction.