成书于天顺五年(1461)的《大明一统志》(三秦出版社,1985年影印本)卷34《汉中府》中关于西乡县的沿革有误。其载“在城东南二百二十里,本汉城固县……后魏改丰宁县,寻又置洋州及洋川郡,隋大业初州郡并废。”早在唐代史书修撰已明了“魏”不同称呼,明代所谓的“后魏”为“北魏” The history of Xixiang County in Volume 34 “Hanzhongfu”, which was written in “Da Ming Yi Tong Zhi” (San Qin Publishing House, 1985 photocopy), which was written in Tianshun five years (1461) was incorrect. Its contained “two hundred and twenty years in the southeast of the city, the city of Chenggu County ... ... after the Wei Wei Fengning County, Xun Yangzhou and Yangchuan also set up, Sui Dye County and county abolition.” As early as the Tang Dynasty history books have been written “Wei” different name, Ming Dynasty so-called “post-Wei” as “Northern Wei”