Abstract: Based on the meteorological data of Tuotuohe meteorological station, Xiaozaohuo meteorological station and Golmud meteorological station from 2000 to 2019, the herbage development period data observed by Tuotuohe meteorological station from 2005 to 2020 and the herbaceous phenological period data of Golmud from 2000 to 2013, combined with the occurrence period of grazing activities, the relevant meteorological indicators of grazing activities are determined by using mathematical statistical methods. The results show that the transition time of summer pasture in Tanggula area is 10~20 days after the first day when the daily average temperature is stable above 5 ℃. The last day when the daily average temperature is stably exceeding 5 ℃ is used as the index of autumn pasture transfer in Tanggula area. The transition time of summer pasture in Golmud basin is 10~20 days after the first day of temperature stably passing 10 ℃; the last day when the daily average temperature is stable above 10 ℃ can be regarded as an indicator of autumn pasture transition in the basin pastoral area. The index of shearing and fleece in Tanggula area is from the first day when the daily average temperature is stably surpassing 10 ℃ to the next 10 days; the index of shearing and fleece in the pastoral area of Golmud basin is from the first day of the daily average temperature over 15 ℃ to the next 10 days. The timescale from the last day of the daily average temperature higher than 0 ℃ to the next 10~20 days is taken as an indicator of the slaughter period in Tanggula area, and it is an indicator of the slaughter period in the basin and pastoral areas from the last day when the daily average temperature is stable above 0 ℃ to the next 15 days.

Key words: grazing activities, meteorological service index, Tanggula, Golmud