The shengxi yinliang, literally "interest-generating silver," was a form of public financing of the Qing dynasty. The Qing government provided loans to special officials and departments or to merchants of special industries on favorable terms (e.g., with interest rate deliberately lower than the market level). This large-scale and long-lasting system of public financing contributed significantly to the prosperity and stability of the economy and society of the Qing dynasty. This paper traces the transformation of the system and evaluates its significance in such industries as the salt monopoly, copper mining and the pawn-brokering.