In this paper, we try to analyze comprehensively and intensely the important phenomenon that there is deposit-loan difference (DLD) in financial institutions. In our study, we have found that, at present, the apprehension of DLD is specious and that, in China's financial institutions, the existence of DLD has been, to a great extent, the upshot of governmental financial control in economic transition. And seigniorage has been the main revenue the government can obtain in financial control. It is this fact that the increase of base money resulting from governmental taxation has been the main cause for DLD in financial institutions. On this basis, in this paper, we have constructed a general analytical framework, forming a strong logic link between DLD, financial control and seigniorage, and analyzing their interrelation and interaction. In our study, we have also found that both the increase of DLD and the rapid swelling of China's M2 and GDP are closely associated with the policy of financial control. This new framework will help to appreciate more comprehensively and more profoundly DLD and the deep meaning-concealed therein- of transition economics.