Abstract:Turnips produced in 9 different counties of Qamdo area in Tibet were studied.The contents of total flavonoids and total saponins，antioxidant activity and protective effects on oxidative stress induced by hydrogen peroxide in RAW264.7 cells were explored.The results showed that there were differences in the content of total flavonoids and total saponins between turnips from different counties.Among them，the total flavonoids content of Gongjue County was the highest，and Jiangda County was the lowest；the total saponin content of Guanzhi County was the highest，and Bianba County was the lowest.The results of DPPH and ABTS+scavenging free radical activity in vitro showed that the antioxidant activities of Gongjue County，Dingqing County and Basu County were superior to those of Jiangda County and Bianba County.By establishing oxidative stress injury model induced by hydrogen peroxide in RAW264.7 cells，the results showed that the turnips samples from Gongjue County，Basu County and Wuqi County could promote cell proliferation and scavenge free radicals in the oxidative stress model.They could also reduce the level of intracellular reactive oxygen species，alleviate the damage caused by oxidative stress on cells，and improve the cell's ability to regulate external oxidative stress.In conclusion，the content of total flavonoids and saponins，and the antioxidant activities in turnips from different regions were different，which provided a scientific basis for the development and utilization of turnips in Tibet.