Abstract: There are explanations of "Xin City" in the work of Shiji Qinbenji.However,the explanation on it in the Zhang Shoujie’s quotation from Koudezhi is a mistake.This article has found that the "Xin City" is also named "Xiaoping City" from the Beiqi Period and the "Xin City" rather than the Taiyuan eparchy.And the article also makes the conclusion that the "Xin City" in the Shiji was located in the area nearby through the method of comparation among the history documents,changes of the location and the name of "Yuchi" or "Langmeng".