Abstract: Within framework of Beijing's "Two Highs and One Smart"（high-standard farmland, high-yield efficiency and smart agriculture）demonstration zone, taking 133.33 hm² core site in Huoxian Town, Tongzhou District as a case study．Technical architecture, key models, economic benefits, and promotion mechanisms were systematically summarized for smart field management platform in enhancing grain yields and enabling low-manpower cultivation．A precision service system with four coupled loops was proposed: space-aerial-ground stereo perception, multi-modal fusion decision-making, intelligent equipment linkage, and cloud hosting services．Additionally, a promotion pathway combining public-benefit platform+standard specification+large-scale operation was outlined．A replicable and scalable high-standard smart farmland demonstration model was provided for deep integration of urban food security and smart agriculture．