| The author studied the intraspecific and interspecific relationship of Common kestrel (Falco tinnunculus) during the breeding period in Zuojia Natural Protection Area in Jilin provice during March to July in 2007 and 2008. The kestrels were attracted by hanging the artificial nest-box. Combined the utilization survey of natural nest-site of interspecific birds, we discussed the study on the basis of behavior and resource utilization .Egg-laying period of Falco tinnunculus' group is convergent comparatively, the peak of egg-laying period is from March 15th to April 15th. The number of Falco tinnunculus'group is confined to nest resource, there are significant difference in number of Falco tinnunculus'group before and after hanging the artificial nest-box. Nest-site selection of Falco tinnunculus is affected by materials, they have a preference for nest-box with materials, especially prefer to using nest-box which contained old materials leaved behind by intraspecific individual after breeding successfully. Falco tinnunculus display obvious territorial behaviors, the average territory acreage is 0.296±0.006ha, there is no overlap between territory, which result in the lowest utilization rate of nest-box within the rang of 50 m. The average distance between the nest of Falco tinnunculus is 148.49±75.98m.The number of avian group which use nest-box increase with the number of nest-box, there are 4 raptors and 3 non-raptors in the artificial nest-box, the total utilization rate is 51.0percent. Because of similar ecological characteristics and demands, for example, they are all use artificial nest-box or magpies nest, prefer to using nest-box with materials, the breeding time exists different degree of overlap, these bird exist obvious resource competition, which makes nest usurpation common. In the process of territory defense, Falco tinnunculus drive obvious large birds, and make no response to small birds.
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