Abstract: Social stocks of metallic substance mainly refer to in-use metal stocks. Analytic method of the in-use metal stocks was given. Influences of metal consumption on the in-use metal stocks and its recycling rate were analyzed under the three circumstances: the metal consumption remains unchanged, chang in a linear trend and change in an exponential trend. In-use aluminium stocks for China were calculated during the period 2006~2009. The results revealed that in-use Al stocks keep increasing and reach 88.9 millions tons in 2009, its average recycling rate is 1.45 percent. Recycling rate of in-use Al stocks will rise in the future along with the reduction of the increasing rate of aluminum consumption. Analysis of in-use metal stocks can provide some basis for resource strategy, industrial policy and environmental policy-making of China's metal industry.