东晋永嘉南渡之后，因战争频繁，人民流徙，南方地区为安置流民而在其聚居地设置的州、郡、县。因其仍沿用其旧壤州、郡、县之名，故在名前加“侨”，故称侨州、侨郡、侨县以区分。计有州郡至百，县至数百，主要集中在长江中下游地区。
东晋南朝时代，侨州郡县普遍设置乃至成为一种制度。
Emigrant state and county were widely set in the Eastern Jin Dynasty and the Southern Dynasty.
虽然如此，东晋南朝设立侨州郡县、实施侨置制度，起码在当时仍然是利大于弊。
But the advantage of setting of emigrant state and county in the Eastern Jin Dynasty and the Southern Dynasty was bigger than shortcoming.
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