Since Taiwan¡¦s building industry started declining in 1994, the government tried several times to save the industry by laws or policies, but the effect was not obvious. There have been hundreds of relative firms closing or downsizing by now. Under this severe recession, how the firms of building industry in Taiwan run business for continuous operation is just the topic of our research. This thesis studies the strategies by theories and industrial-cases collection. After analyzing the building industry in Taiwan (life-cycle, value-chain, and development trend), we develop theoretical strategies for the industry, and then we collect industrial cases to compare. We find that the real strategies of the firms match the theoretical ones we develop very well. Basically, the strategies of the firms of building industry in Taiwan can classify into four types: 1.Market-penetration strategy 2.Product-development strategy 3.Market-development strategy 4.Diversification strategy. Besides, we provide the experience of Tonyan building Ltd. Co.for case study. By studying its target-marketing and win-win system, we share the precious experience with everyone. As a member of Taiwan¡¦s building industry, we hope to contribute ourselves to the continuous survival of Taiwan¡¦s building industry by theory and practical experience.