Abstract: The inbred-fruitfulness of 10 alfalfa varieties treated with 3 inbred ways and 2 pollination modes were investigated. The result indicated that the different treatments had varied inbred-fruitfulness rates, the difference was significant, but the difference was not obvious among each treatment for helical number of per-pod arid thousand seed weight of seeds. The self-fruitful rates of 3 inbred ways presented an increasing tendency according to the order of inbred in single flower—— inbred in same inflorescence ——inbred in same plant, and the difference between the inbred in same inflorescence and that in same plant was not evident, but all had significant difference level with inbred in same flower. Compared with spontaneous pollinationl the artificial pollination was able to increase obviously the self-fruitful rate of alfalfa. But artificial pollination did not improve significantly the seed setting rate of inbred in single flower, however it mainly increased the self-fruitful rates of inbred in same inflorescence and same plant.