Abstract I. Introduction II. The Life cycle of the lron & Steel industry in china, the United States, and Japan 2.1 The Life cycle of the lron & Steel Industry in the United States 2.2 The Life Cycle of the lron & Steel Industry in Japan 2.3 The Life Cycle the iron & steel industry in China III. Comparative analysis on the lron and Steel Products Structure among China, the United States, and Japan 3.1 Comparison of the lron & Steel Product Structure in the Same Period 3.2 Comparison of the lron & Steel Product Structure in the Same Stage of the Industrial Life Cycle 3.3 Main Problems of Chinese Steel Products Structure IV. Evolution of Chinese Steel Products Structure V. Conclusions References