Abstract: Under the dual imperatives of global climate change and energy structure transition, the efficient conversion and utilization of CO₂ has emerged as a pivotal pathway toward achieving the “dual carbon” goals. Olefins, as essential chemical feedstock, are traditionally produced through fossil resource-intensive processes characterized by high energy consumption and substantial carbon emissions. Consequently, the catalytic hydrogenation of CO₂ to olefins using green hydrogen presents a promising strategy to mitigate greenhouse gas emissions while reducing reliance on petrochemical resources. Against this backdrop, this review systematically summarizes recent advancements in CO₂ hydrogenation to olefins, with a particular focus on catalyst design and reaction mechanisms. The review begins with a comprehensive overview of the primary technical routes for CO₂-to-olefins conversion, including the CO-mediated pathway and MTO pathway. Subsequently, it elaborates on catalyst design strategies, encompassing the selection of active components （e.g., Fe-based and Co-based catalysts）, the incorporation of promoters （e.g., alkali metals and transition metals）, and the optimization of supports （e.g., metal oxides and carbon-based materials）. These strategies significantly enhance catalytic performance by modulating electronic structures, surface acid-base properties, and the exposure of active sites. Regarding reaction mechanisms, the review provides an in-depth analysis of the CO-mediated and methanol-mediated pathways. The CO-mediated route involves sequential steps such as CO₂ adsorption/activation, CO formation/diffusion, and C-C coupling/hydrogenation during FTS. In contrast, the methanol-mediated pathway enables direct CO₂-to-olefins conversion via a two-step process, circumventing the Anderson-Schulz-Flory distribution limitation and markedly improving selectivity toward light olefins. Finally, the review oulines future research directions, including the development of more efficient and stable catalytic systems, as well as the design of novel reactors （e.g., multi-stage or membrane reactors） to enhance process efficiency. In summary, this work systematically examines catalyst design principles and mechanistic insights in CO₂ hydrogenation to olefins, critically evaluates the merits and limitations of different technical approaches, and proposes key areas for future investigation. With the growing emphasis on green chemistry and sustainable development, CO₂ hydrogenation to olefins holds significant potential as a transformative technology for achieving carbon neutrality.