Abstract: Habitat is a synthesis of pattern,process,and scale as a landscape system.As a result,landscape connectivity is introduced into the study on habitat of red-crowned crane(Grus japonensis) during its breeding season in the Naoli River basin.With the habitat suitability index(HSI) model and ArcView,landscape connectivity zones can be delineated in the maps.Based on the statistics,it is found that the number of small habitat patches,defined as less than 0.1 km² in area,takes up 71.88% of the total of suitable habitat patches.And the area of the suitable habitats just accounts for 5.35% of the whole basin.What is more,only 78.37% of the suitable habitats in area is considered to be used by the bird in its breeding season.It could be found that the suitable habitats are extremely fragmented.Human activities,along with landscape connectivity and percolation among the habitat patches,are the main causes for the decrease in area of useful habitats and the habitat fragmentation.Besides,landscape connectivity zones are distributed mainly along river banks within the basin.It also shows that landscape connectivity has a great impact on the use of small habitat patches.This study helps us to know the current situation of the red-crowned crane habitats and their distribution.