Abstract: To solve the means of livelihood of Bannerman is an essential problem for Banner affairs in earlier stage in Qing Dynasty. Since Kangxi Emperor, the following emperors in reign all adopt economic measures to ameliorate the situation. And one of most successful measures is the system of "Sliver Currency (Tael Currency)for Interests" implied from the first year of Yongzheng reign. On the other hand, in order to increase the incomes of imperial treasury, Nei-wu-fu also debits silver currency to merchants and so on. The system of "Silver Currency" is evidently different from debit of imperial treasury as well as the two relate to each other. By analyzing the operation of silver currency which to the Nei-wu-fu and explicating the procedures of debit of imperial treasury, author makes a definite relationship between the two systems.