On the basis of a review of the literature, especially the international trade data of European countries, I tried to estimate and determine the yearly amount of silver inflow into China during the years 1645-1911. About half a billion ”liang” of silver were imported into China during the Ching Dynasty. Any attempt to integrate various periods and individual data, to achieve correct and consistent results, is very difficult but worthy. My estimations were ultimately compared with the data in the literature. The results indicate that my figures are plausible and thus acceptable.