公元前２２１年秦朝时期 ,我国人口达二千万。到西汉２年 ,达到五千九百五十九万 ,突破了五千万大关 ,为第一个高峰。从西汉到北宋 ,人口始终在五千多万的数字上徘徊。到了南宋 ,１２２３年 ,达到了七千六百八十一万 ,突破了七千万大关 ,为第二个高峰。从南宋到清顺治时期 ,人 During the Qin Dynasty in 221 BC, China had a population of 20 million. In the 2nd year of the Western Han Dynasty, it reached 59.5 million, breaking the 50 million mark and becoming the first peak. From the Western Han Dynasty to the Northern Song Dynasty, the population has always hovered on more than 50 million figures. In the Southern Song Dynasty, it reached 72.81 million in 1223, breaking the 70 million mark and becoming the second peak. From the Southern Song Dynasty to the Qing Shunzhi period, people