Saussurea lappa fine variety breeding method

The invention discloses a saussurea lappa fine variety breeding method, and belongs to the technical field of medicinal plant breeding. In the method, sand loam with the altitude between 2,600 and 2,900m and the frostless season more than 250 days is selected; 22,500 to 45,000kg/hm of well-rotted farmyard manure and 225 to 450kg/hm of compound fertilizer containing more than or equal to 15 percent of N, more than or equal to 15 percent of P2O5 and more than or equal to 15 percent of K2O are applied as base fertilizers; in the period of the first 1 to 2 years, urea containing more than or equal to 45 percent of N and/or the compound fertilizer are used as the additional fertilizer for three times; and the triangular hole sowing distance is 10-20cm*20-30cm, and the seeding quantity is12-15kg/hm . The method can make the seed yield reach 742 to 783kg/nm , the thousand seed weight reach 24-25.6g, the seed sprouting percentage reach 93-95 percent, and the seed purity reach 97-99percent, which are respectively impr