Abstract: From October 2011 to October 2012, a total of 43 species and 4823 individuals of bird were recorded in the 20 hm2 sample area of the forest ecosystem of Tiantong National Station (Zhejiang Province,China). Black Bulbul (Hypsipetesleucocepalus), Light-vented Bulbul (Pycnonotussinensis), Chestnut Bulbul (Hypsipetescastanonotus), Black-throated Tit (Aegithalosconcinnus), GreatTit (Parusmajor) and Grey-cheeked Fulvetta (Alcippemorrisonia) were dominant species. Based on vertical, horizontal, DBH and perched 〖JP2〗patterns of dominant bird species, the niche breadth indices by Hurlbert (1978), the niche overlap indices by Schoener (1986). It was discussed that the utilzation states for space, the interspecific relationships of dominant bird species and the space-time niche〖JP〗 changed. The results suggested that: The niches of dominant birds are separation in different dimensions. In different space-time scales,  the niches are dynamically changeable and finally tend to maintain stability in multi-dimension. It was found that the reasons for the dominant birds kept their community structure stable are that these species ecological niches are separating in different dimensions and changing in space and time.

Key words: dominant birds, spatial dimensions, ecological niche