Abstract: Various data of growth about Simmentals in Yunnan province shown that the difference of the natural weight between the original Simmentals and the Simmentals which were born in Yunnan later on three years was not significant (P>0.05), but were remarkable higher than the Simmentals which were born from 1999 to 2000; and at subsequent each age stage(0.5-9 years), the weight of the original Simmentals were remarkable higher than local pureblood Simmental (P<0.05),but along with the exaltation of feed management level. The weight and growth speed of the simmental which were born in 2004 get an improvement.

Key words: simmental; yunnan; growth model; adjustability