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The Cotton Research Institute of China Academy of Agricultural Sciences has developed a series of patented products of substrate seedling raising technology, such as leaf protectants and root promoters, formulated the technical regulations of substrate seedling raising management, and defined the technical standards of water management, seedling picking and transplanting, and seedling cultivation. This seedling raising technique is generally suitable for transplanting cotton seedlings with 2 leaves 1 kernel, and the seedling raising period is 25-30 days. The technical operation model has well solved the problems of slow rooting, long slow seedling stage and defoliation in bare seedling transplantation. The following key links should be paid attention to when using cotton substrate seedling raising technology. (1) Seedbed preparation. Determine the seedbed area according to the field transplanting density. Generally, planting 1800~2000 plants per mu requires a seedbed of 3.6~4 square meters. The seedbed should be higher than the ground, rectangular, with a bed width of1.2m.. The bottom and periphery of the bed are covered with plastic film, with the height of 10~ 12 cm and the film thickness of 10 cm. (2) sow in time. Generally, seeds are sown in mid-April and seedlings are raised in a small arch shed. Water is poured on the substrate from the soles of feet, and a sowing ditch is opened according to the row spacing of 10 cm, with the ditch depth of 3 cm and the plant spacing of 2 cm, and 1 seed is sown in the hole of 1 seed. After sowing, cover the substrate, flatten and suppress, cover the bed with plastic film, and cover a small arch shed. The ditch around the seedbed. (3) Seedbed management. Seedbed management is mainly based on control, which is mainly reflected in temperature control, water control and leaf age control of cotton seedlings. The temperature of the seedbed is controlled at 20~35℃, and it is often ventilated to reduce the temperature and humidity to prevent the formation of tall seedlings. The water control pipe of www.tsyuming.cn bed should master the principle of long root, and irrigate 1~2 times during the whole seedling period. Strictly control the transplanting of cotton seedlings at 2~3 leaf stage and master the principle of unequal seedling time. 5~7 days before transplanting, the seedlings are ventilated day and night. Water the seedlings 7~ 10 days before transplanting, and do not water them when raising them. Spraying leaf protectant on the day of seedling emergence, carefully seedling emergence, reducing root damage. (4) Improve the transplanting quality. The soil moisture is sufficient, the ground is flat and the soil is loose. Before transplanting, soak cotton seedling roots with root promoter 15 minutes, and wrap the roots with plastic film. Strong seedlings and weak seedlings should be transplanted separately, so that the depth is appropriate, and the planting depth can reach half of the height of seedlings (6~8 cm). Cotton seedlings should be righted and compacted, and must be watered.