本文介绍了吉丰优866的选育过程、特征特性，总结了其高产栽培和制种技术。该品种是以吉丰A为母本、广恢866为父本，杂交选育而成的三系杂交稻组合。其在广东地区种植，生育期适宜、抗倒性强、分蘖力佳；2022年生产试验平均产量7 690.35 kg/hm²；整精米率61.2%～65.7%，高抗稻瘟病、中抗白叶枯病，耐寒性中强。其高产栽培技术包括在7月10日前适时播种，1叶1心期喷施多效唑以控高促蘖；在5.5叶前合理密植，做到浅插、直插；施足基肥，分阶段及时追施氮肥、钾肥和复混肥；干湿交替灌溉，前期浅水促返青，中期晒田控无效分蘖，后期保证水分供应；病虫害防治遵循综合策略，利用诱虫灯、生物制剂及低毒化学药剂进行科学防控。高产制种技术包括科学安排基地与播期，依据父母本特性（父本花期集中，母本扬花期短）及地域气候计算播差，确保父本花期较母本早1~2 d；精细肥水管理，分阶段施足基肥、分蘖肥、父本肥及穗肥，采用浅水灌溉与干湿交替的水分管理模式；病虫害综合防治，针对稻飞虱、螟虫及主要病害施用噻嗪酮等药剂；适时喷施“九二〇”，以优化株高差，利于授粉；全程严格除杂与隔离，从秧田到抽穗期多次去杂，设置300 m以上隔离区；授粉后先割父本，成熟后选晴天机械收割母本。本文为吉丰优866的规模化生产与推广提供参考。

The breeding process and characteristics of the rice variety Jifengyou 866 were introduced, and its high yield cultivation and seed production techniques were summarized. This three-line hybrid rice combination was developed by crossing the female parent Jifeng A with the male parent Guanghui 866. When cultivated in Guangdong, the variety exhibited an appropriate growth period, strong lodging resistance, and good tillering ability. The 2022 production trial showed an average yield of 7 690.35 kg/hm². The whole milled rice rate ranges from 61.2% to 65.7%. The variety demonstrates high resistance to rice blast, moderate resistance to bacterial leaf blight, and medium-strong cold tolerance. High yield cultivation techniques include: sowing before July 10th and spraying paclobutrazol at the 1-leaf-1-heart stage to control plant height and promote tillering; reasonable dense planting before the 5.5-leaf stage with shallow and straight transplanting; applying sufficient base fertilizer, followed by timely topdressing with nitrogen, potassium, and compound fertilizers at different growth stages; adopting alternating wet and dry irrigation: shallow water for early seedling establishment, mid-term sun-drying to control ineffective tillers, and adequate water supply at later stages; implementing integrated pest management using insect traps, biological agents, and low-toxicity chemical pesticides. High yield seed production techniques involve: scientific selection of production bases and sowing schedules, considering parental characteristics (concentrated male flowering, short female flowering) and local climate to ensure the male parent flowers 1–2 days earlier. precise fertilizer and water management, including sufficient base, tillering, male-specific, and panicle fertilizers, with shallow irrigation and alternating wet-dry cycles; integrated control of pests (e.g., planthoppers, borers) and diseases using chemicals like buprofezin; timely application of “920” to optimize height difference for improved pollination; strict roguing and isolation: multiple removals of off-types from seedling to heading stages, with isolation zones over 300 meters; harvesting male plants first after pollination, followed by mechanical harvesting of female plants on sunny days. This study provides a reference for the large-scale production and promotion of Jifengyou 866.