Since (Shi Ji) put forward the Bo Town of Tang lived, it was difficult to judge where was the Bo Town.Some main theoris were South Bo、West Bo、North Bo 、 Zheng Bo etc.The theory of South Bo appeared earliest and historical documents was the most abundant too. Despite the theory of South Bo has limitations,it is more persuasive and rationality than other theories from the piont of archaeology and sociology. But there is a new understanding about South Bo, South Bo is not a Town but rather a whole Bo of Song district.