Abstract: The sanple survey on Jiannan reveals that Yuan E Ren Ding(original Ding) in Da Qing yi tong zhi(National Gazetteer of Qing Dynasty)was based on different records of “Ding” in Jiangnan tong zhi(Local Gazetteer of Jiangnan)complied in Qian-long period of Qing dynasty, with no standards. The case study also indicates the danger of applying those figures to history research directly.

摘要： 本文以江南为例,揭示了三版《大清一统志》中"原额人丁"的来源以及各地"原额人丁"的建构过程,证明"原额人丁"来源于乾隆《江南通志》中复杂多样的"人丁"记录。"原额人丁"的涵义复杂,定义不一,没有统一的标准,在研究中不假思索地利用这些数字是极其危险的。