以30 cm等行距种植为对照，探讨了宽窄行（窄行行距20 cm，宽行行距分别为30、35、40、45和50 cm）机插水稻产量的形成规律及适宜机插规格。结果显示，与对照相比，在宽行行距适宜范围内，宽窄行机插增产1.1%~6.5%，差异显著，增产主要归因于群体颖花量的增大、群体结构的优化和后期光合物质生产与转运能力的增强。其中，窄行行距20 cm、宽行行距40~45 cm的宽窄行栽插规格是实现高产的最优模式。

Discussion on the yield formation characteristics and suitable planting density of machine transplanted rice under wide-narrow row（narrow row spacing is 20 cm, and wide rows spacing are 30 cm, 35 cm, 40 cm, 45 cm and 50 cm respectively） method, the equal row（spacing is 30 cm） method as the control. The results showed that, compared with CK, the yield of wide-narrow row method increased by 1.1%~6.5% under suitable wide row range, the reason for the increase of yield were the total spikelets increased, rice population structure optimized and photosynthetic production and transportation during grain-filling phase improved. Wide row spacing of 40~45 cm and narrow row spacing of 20 cm is the optimal density to achieve high yield.