Method for improving germplasm creation efficiency of Chinese cabbage

The invention discloses a method for improving the germplasm creation efficiency of Chinese cabbage. The method specifically comprises the following steps: S1, preparation of stocks and scions: selecting a hybrid variety with a large root as a stock material, selecting a bolting-resistant spring Chinese cabbage hybrid variety as a scion material, and sowing and vernalizing stock and scion seeds; S2, field planting; S3, grafting environment management: enabling plants to grow by controlling the environment temperature to be 15-20 DEG C, and irrigating roots with a chlormequat chloride diluent when the plants sprout for 20 cm; S4, grafting condition selection: taking second primary branches of the stocks as grafting parts, and selecting primary branches with the length of 6-10 cm as the scion; S5, grafting: grafting scion buds on the stock plants; and S6, management after grafting: after grafting is completed, managing grafted plants by controlling the growth environment temperature. The method can effectively