徐贞明(约1530-1590年),字孺东,一字伯继,江西贵溪人,官至尚宝司少卿,为明代后期倡导海河水利的代表人物。徐贞明认为,由于首都设在北京,而赋税集于东南,每年从江南一带通过运河运输数百万石粮食北上,耗费大量人力物力。运河沿途穿越的长江、淮河 Xu Zhenming (about 1530-1590), the word 孺 East, following the word, followed by Guixi, officials Shang Shang Bao Si Shaoqing, for the late Ming Dynasty representative of Haihe River water advocate. Xu Zhenming believes that as the capital is located in Beijing and the taxes are collected in the southeast, a large amount of manpower and material resources are spent on transportation of millions of stone food northward from the area along the Yangtze River every year. Through the Yangtze River along the canal, the Huaihe River