《旧唐书·本纪·卷十一》
八月一日，宰相元载上奏疏请求把中都归到河中府，可以回避吐蕃入侵的祸患。上奏的疏章没有回音。
八月辛卯，宰臣元载上疏请置中都于河中府，秋杪行幸，春中还京，以避蕃戎侵寇之患。
On August 1, Prime Minister Yuan Zai submitted a memorial requesting that Zhongdu be returned to the Hezhong Prefecture, which could avoid the disaster of the Tubo invasion. The memorial was not answered.