The purpose of this study is to examine the ethical attitudes toward accounting purposes, accounting treatments and academic behavior amongst chief accountants, CPAs and students majored in accounting. According to the questionnaire responses from 65 chief accountants in the listed companies, 63 CPAs and 287 accounting students, the research results are as follows: Different roles present significant different ethical attitudes. The chief accountants and CPAs have higher ethical standards for both accounting practice and academic behavior than those of students. However, after controlling the effect of academic ethics, the students exhibit more rigid accounting practice ethical standard. The relationship between the ethical attitudes of accounting practice and academic behavior is significant positive. The subjects of post-conventional moral development level exhibit a higher ethical standard on the attitudes of academic behavior, but not on those of accounting treatment.