Abstract: The issue of currency provided the most primitive power to the economic development of Qing under the monetary economy． The money made from central and local casting bureaus became an important source of the GDP.The period of Qianlong was the peak for casting copper coins． The cost and quantity of central and local casting bureaus，called“copper administration”by the Qing government，framed the Qing dynasty's most important part of the national economy． Attention should be paid to the fact that the governmental economic operation had a contribution to the GDP．In addition，careful accounting of the economic data in the traditional Chinese economic model could also be used as a new approach to the GDP estimation of the Qing dynasty．