The area where the Yinjiawopu site in Da’an City, Jilin Province is located was under the jurisdiction of “Zhaozhou” under the Huining Prefecture of Shangjing during the Jin Dynasty. There are many references in the History of the Jin Dynasty about Zhaozhou being an important salt-producing area during this period. From 2014 to 2015, a joint team from the Research Center on Chinese Frontier Archaeology at Jilin University and other institutions conducted excavations at the site, which proved from an archaeological perspective that the “Zhaozhou salt” recorded in the literature was actually soil salt. Based on the excavation data, combined with historical documents and relevant information on soil salt production in modern times, the authors not only reconstructed the overall process of soil salt production shown in the remains of the Yinjiawopu site, but also further demonstrates that the site was a settlement which prospered because of salt production during the early and middle phases of the Jin Dynasty. The soil salt production and technology of the Jin Dynasty reflected in this site also constitute a microcosm of the soil salt production in Northeast China during that period.