| Due to the productivity problems in the north of China,the 30 alfalfa with the different grades in fall dormancy from China and abroad were selected to research the influences of component factors of yield characters, the late autumn cutting, and fertilization on the cold resistance of alfalfa in suburb experimental field in CAAS. The results were shown as follow:1 The main factor that affected the plant height, the internodes length and the yield, was regeneration rate, indicating that plant height, internodes length and the yield increased with the increase of regeneration rate2 The contents of proline and soluble protein in root were highly related to the cold resistance of alfalfa cut in 20th September in the first year growing. The POD activity in root was highly related to the cold resistance of alfalfa cut in 5th October.3 The POD activity had highly relationship with the cold-resistance of alfalfa cut in the last time in the second year growing. At the same time, it was found that the critical growing period of alfalfa was from 5th to 20th November.4 The variation of the free protein, the soluble protein, the soluble sugar and the POD activity in root had no effect on the cold resistance of alfalfa cut in the last time in the third year growing, which showed that the alfalfa in the third year had more cold-resistance and adaptability than that in the first and second year growing.5 The critical period of the cold resistance for alfalfa growing was the mid of November in the Huhhot region6 The fertilizer affected the contents of soluble protein and the soluble sugar in the root of alfalfa. The content of soluble protein in non-fertilizer treatment was higher than fertilizer treatment. The contents of soluble sugar in treat 2 and 3 with higher fertilizer were higher than that in treat 1 with lower and no fertilizer. The optimal fertilizer was beneficial to increase of the overwinter rate of alfalfa.
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