Steel social stock is an important part of social material wealth, fully use of steel social stock which accumulates in the social and economic system can effectively solve a series of resources and environment problems, patterns analysis of steel social stock during the process of industrialization can provide the basis of resource strategy, energy strategy and environmental policy. Based on the basis of full understanding and effective tracking of the steel social flow and stock, this paper constructed a model of dynamic material flow analysis of steel social stock to analyze steel social stock level and its evolution trend in China, USA and Japan. Results show that there is similar stock process with significant characteristics presenting a trend of slow growth-quick growth-rapid growth in China, USA and Japan before industrialization, that per capita stock of steel in USA and Japan reached 11t/cap during the stage of post-industrialization, as a result, their economic growth is coupled with steel consumption trend. Steel social stock has intrinsic connection with industrialization process, and different industrialization processes are corresponding to different steel social stock levels. According to the experience of USA and Japan, we can predict that Chinese per capita stock of steel will increase and reach saturation eventually during the stage of later industrialization and post-industrialization, however, China has big population, a lot of resources will be consumed in reaching per capita steel stock of USA and Japan and environmental pollution will be brought in accordingly, thus, in the process of the construction of socialism with Chinese characteristics at new era, China should move forward through new-style industrialization and work hard to lower the per capita steel stock saturation level by technical innovation and structural reform at supply side as well as life style change.