Abstract: Supplementary fattening experiment on Oula type of Tibetan sheep lamb in Guinan alpine region of Qinghai during grass withering period was carried out. Results showed that the lambs during grass withering period were fed through grazing and supplying beneficiated material particles with ad libitum feeding, the average weight and daily gain of 11 -month sheep after 60 days reached 40.58 kg and 71.83 g respectively, which were increased by 9.41 kg and 109.83 g compared with control （P〈0.01）, so the gaining effect was very obvious; the carcass weight and dressing percentage reached 17.71 kg and 43.65%, which were increased by 5.69 kg and 5.09% compared with control （P〈0.05）, and every sheep could gain 86.80 yuan more than control, so the economic benefit was very significant.