Daytime behavioral pattern of Great Spotted Woodpecker (Picoides major)at the wood in cropland environment was investigated in Wulateqianqi County,Inner Mongolia in 3 summers (July-August) and 3 winters (December to February) from 2005 to 2008.By using animal-focus method we found that foraging and pecking were the most frequently recorded behaviours.A significant difference was found between different behaviours in the daytime.Behavioral rhythm was obvious in summer with a rest peak at midday,while in winter the bird neither showed a rest peak at midday nor obvious behavioral rhythm.No significant difference was found in behavioral patterns between male and female.The daytime behavioral pattern of Great Spotted Woodpecker was significant difference between summer and winter,the birds spent longer time for movement in summer than that in winter.