Mechanization has become the important development direction of rice production with the rapidly development of economy and the transfer of rural labor force in recently years. In order to screening suitable rice cultivars for machine transplanting in Hunan Province, field experiments were carried out to study the grain yield and growth period using 11 late rice cultivars including H-you 518 and so on. The results indicated that enough effective panicles and safety full heading are preconditions of high yield of late rice. So the machine transplanting late rice cultivar should have the characters of strong tiller ability, moderate growth period and good har-mony between grains and panicle.%随着经济的快速发展和农村劳动力的大量转移，机械化已成为水稻生产发展的重要方向。为了筛选适宜湖南地区机械化高效生产的晚稻品种，以H优518等11个组合为材料，在大田栽培条件下研究了其产量及生育期表现。结果表明，保证足够的有效穗数和安全齐穗是双季晚稻机插获得高产的前提。因此，在湖南进行双季晚稻机插，应选择生育期相对适中，分蘖力较强，穗粒结构协调的品种。
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