唐建中四年(783)十月三日“泾原兵变”发生以后,德宗出逃奉天(今陕西乾县)。不久,唐旧臣朱泚称帝,旋展开对奉天城的围攻,德宗君臣在极端不利的条件下据守奉天城四十余天,直待到唐将李怀光西返,才解德宗绝境,我们将这段时间发生在唐德宗君臣与朱泚叛军间的激烈战事,称作“奉天保卫战”。关于“奉天保卫战”这一历史事件,两《唐书》、《通鉴》等主要史料均作了一定程度的描述和评价,当时唐人记录此事件的专著,并保留至今者,则有赵元一的《奉天录》 Tang Jianzhong four years (783) October 3 “Jingyuan mutiny ” occurred, Dezong fled Fengtian (now Shaanxi dry county). Soon, Tang Jiuchen Zhu Yong proclaims the emperor, spin unfolds to Fengtian City’s siege, Dezong monarch under the extreme unfavorable conditions, according to Fort Heaven more than 40 days, until the Tang will Li Huai-guang westward, only Dezong desperate, we will this period The time took place between the fierce fighting between Emperor Tung-tsung and the rebel forces of Zhu 称, called “the Battle of Fengtian”. On the history of “Fengtian defending war”, the two major historical materials such as “Tang book” and “Tongjian” were all described and evaluated to a certain extent. At that time, the Tang people recorded the monograph of this incident and kept them up till now Zhao Yuan a “Fengtian recorded”