This project tries to combine the theory of ethical policy and business ethics from a managerial perspective in order to understand how ethical policy is practiced in Taiwan. It further sets our specific guidelines for practicing ethical policy and analyzing the relationship among ethical policy, ethical climate and organizational performance. Date for analysis are collected from a questionnaire and surveys which were used for quantitative study. The questionnaire was given to two groups of people ;one managers and the other staff. The former will include variables regarding ethical policy and organizational performance.The later will include surveys of ethical climate.Purposive sampling method was conducted, and samples were drawn from housing, air cargo services, banking, accounting consolting, food industry ,products of petroleum and chemistry, electronics, information and mass communication. The samples covered eight industries, thirty companies and they were collected from three hundred and sixty-sixres respondents. The following results are found: 1)the size of the company and its years of establishment will affect some of its patterns of ethical climate; 2)there is obvious relationship between proactive ethical policy and ethical climate which is based on a code of considerate and independent judgement. On the other hand, there is obvious difference between proactive and reactive ethical policy, in terms of its performance in code-oriented ethical climate: 3)training in ethics, rules for punishment, rewards and establishment of foundation will have obvious effects on ethical climate: 4)proactive ethical policy is better than its reactive counterpart in terms of its organizational performance; 5)in terms of organizational performance, ethical climate based on a code of considerate and independent judgement is better than a profit-oriented climate.