Abstract: The paper aims to investigate the impacts of climate factors on growth period change of hulless barley in Shigatse’s protect irrigation field. The authors analyzed the trend, abrupt change and correlation of the growth period length of hulless barley and the meteorological elements in growth period based on observational data of the growth period and meteorological data. The results showed that: during 1992-2012, the average growth period of hulless barley in Shigatse presented an obvious decreasing trend with a rate of 0.68 d/a; the temperature and sunshine duration played a pivotal role in the growth period change, there was a negative correlation between mean temperature and growth period days at three leaf and maturity stage, and a positive correlation at booting and milky stage; the sunshine duration had a positive impact on the growth period at tillering and booting stage, but a negative impact on jointing and flowering stage; several growth periods of hulless barley showed an abrupt change, the tillering and milky stage abruptly changed in 2001 due to the change of barley variety from‘Zangqing 320’to the others. After variety replacement, the sunshine duration showed less impact on the tillering stage, and the days of milky stage increased by 16 days at the same time.