Abstract: Character of rhizoma sprouting and their role in regeneration of Mongolian Sweetvetch were studied. The results showed that(1) Soil temperture and thickness of rhizome are main factors affecting sprouting. Thickness reflects the mature degree of rhizome.(2) In artificial community, the proportion of sprouting individuals increase in form of cxpontntial function(y=104.7e^-1.55/x) as age increased. In natural community, the proportion of sprouting individuals reached 92.7 per cent.(3) Under natural condition, the vegetative regeneration, i·e·rhizome sprouting is main mode of regeneration of Mongolian Sweetvetch. This mode of regeneration can maintain the community stable enough.