Hand in hand with prosper of International business brought by globalization, many ethical problems have been surfacing in the past decades: bribery, corruption, human rights issues, etc. Business ethics, as an academic discipline as well as a business practice, is becoming the focal point of waged and animated debate. The increasing attention on it generates many relative theories, among which Freeman’s stakeholder theory stands out. This paper, backed by Freeman’s stakeholder theory, conducts a case study of Simens’ violation of business ethics by analyzing its recent bribery scandal in Argentina. After a detailed analysis of the interests of Siemens’ stakeholders, it draws a conclusion of Siemens’ severe violation of business ethics, and thus suggests some solutions.