Li Bin. the planner of the famous Dujianyan Irrigation System more than two thousands years ago. was also recorded as the very first in ancient. to initiate the drilling of wells for salt. Along with the improvement of drilling technology during the long period from the Song to the Qing Dynasties, the production of well salt reached its height. Even in ancient times, salt was considered one of the most valuable of all foods and a rich gift bestowed on us by nature. The production of salt has also brought great benefits to the governments of every period. Salt production is of great importance to the nation’s economy and people’s livelihood. lts significance goes far beyond the flavor we tasted on our tongues. The planner of the famous Dujianyan Irrigation System more than two thousand years ago. Was also recorded as the very first in ancient. Song to the Qing Dynasties, the production of well salt reached its height. Even in ancient times, salt was considered one of the most valuable of all foods and a rich gift bestowed on us by nature. The production of salt has also brought great benefits to the governments of every period. Salt production is of great importance to the nation’s economy and people’s livelihood.