Xia Yanzhou, Lechang County in the early Han Dynasty, belongs to the East County, and its address is located in the northwest of Nanle County17.5km north of Cang Xie Ridge. Because there was Changyi City in the ancient county, it is said that Changyi, the son of the Yellow Emperor, built it. "Music" takes the meaning of Woye Pyongyang and boundless heaven. Changle County is located in the Western Jin Dynasty, and the county governance is the same as that of Lechang. Why the word "Lechang" is reversed may be related to Gu's disrespectful name. Nanle's old records and new records all say that this county is looking for waste. This is ominous time and why Kim gave up Changle County in a hurry.