Human resource strategy and practices are effective ways to sustain organizational competitive advantage under the concept of strategic human resource management. It was proved that human resource strategy and business strategy have causal relationship. However, we need to explore the relationships among industry environment, business strategy and human resource in corporations of Taiwan. Using literature review and case studies, this research targeted six firms, which were sampled purposely, to conduct an in-depth interview to explore the relationships among human resource strategy, business strategy, and industry life-cycle. And the results showed below: 1.Business strategy is influenced by industry life-cycle stage and industry category. 2.Different business strategic will result in different human resource strategies and practices, that is, the principle of ¡§fitness¡¨. 3.Operation of human resource management will output multi-changes and combinations, due to cross influences of multi-factors.