During October 2004 to March 2005,we studied the population dynamics in wintering period of Eurasian Cranes(Grus grus)and daily time budget in Lashihai Lake,Yunnan Province.Eurasian Crane wintered in the Lashihai Lake for 175-180 d.The duration could be classified into four phases:immigration phase(early October to late November),migrating stopover phase(end of November to end of December),steady-going wintering phase(early January to middle of March)and emigration phase(late March).Eurasian Crane spent 75.53% of total daily time in feeding about,14.66% of their time in vigilance,5.05% in preening and 4.49% in resting.The time budget in each of the four activities was fairly significantly difference in each of the four phases(immigration,migrating stopover,steady-going wintering,and emigration).Individuals,no matter adults or juveniles with in flocks devoted less time in to vigilance and more time in to feeding than the family members.