水稻是我国的主要粮食作物，发展水稻生产机械化，对于增强我国农业综合生产能力、保障粮食安全、增加农民收入、推进农业供给侧改革和绿色发展具有十分重要的意义。水稻秧龄的调控是水稻机械化生产的限制因子和关键过程，对水稻机械化精确栽培和产量形成有着十分显著的影响。本文概述了机插水稻秧苗小苗、中苗和大苗叶龄划分，阐述了水稻大苗机插存在的问题及发展的技术措施，以期为水稻全程机械化发展提供有效途径。

Rice is one of China’s major food crops. The development of mechanized rice production is of great significance for enhancing China’s comprehensive agricultural production capacity, ensuring food security, increasing farmers’incomes, promoting agricultural supply-side reform and green development. Regulation of rice seedling age is the limiting factor and the key process of rice mechanization production, which has a very significant impact on precision cultivation of rice mechanization production and yield formation. In order to provide an effective way for the entire mechanization of rice development, this paper summarized the classification of rice seedling for mechanized rice production, clarified the existing problem and its developing technical measures of machine-transplanted rice.