Habitat selection of birds is related to climate, habitat and human disturbance, and there are differences in their life periods due to changes in needs and environmental resources. In order to clarify the process, in Sanjiang Plain, we analyzed the oriental white stork fledglings' movements by fixed Kernel Home Range method (95% level) during July to October based on satellite tracking data. Then subdivided the breeding season into two periods: Wandering around nests and after leaving nests. During the early period, the activity range is narrow and highly concentrated in a single area, while during the later period, they scattered and wandering in multiple areas in the eastern part of the Sanjiang Plain. Then we used Maxent model to evaluate the variability in habitat suitability including factors' influences. The results showed that the Percent contribution of factors such as Land cover type(11.8%/30.6%), Water (23.8%/31.2%), Humidity(8.1%/15.5%), Meadow(28.6%/3.2%) and Wind speed(13.2%/2.1%) are different in two periods, and the more suitable habitats area in the later period (0.5-1) is doubled in the early period and showed greater tolerance to human disturbance. Our study could be used for dynamic protection and effective integrated management of Oriental White Stork and other migratory species.