This report provides a comprehensive analysis of accounting scandals that have shaken the financial world, focusing on three prominent cases: Enron (USA), One-Tel (Australia), and China Medical Technologies (China). The executive summary highlights the core issues, including the irregularities, the motivations behind them (greed and personal benefits), and the failures of auditors to detect and prevent these fraudulent activities. The introduction underscores the importance of effective internal management and auditing in mitigating such risks. The discussion and analysis sections delve into each company's specific context, detailing the fraudulent practices, the roles of management and auditors, and the impact on investors and the broader accounting landscape. The Enron case explores fraudulent accounting practices, the role of Arthur Andersen, and the subsequent enactment of the Sarbanes-Oxley Act. The One-Tel case examines the company's collapse due to poor management and unethical accounting. The China Medical Technologies case is also analyzed, illustrating how these scandals have impacted the accounting world and investors as a whole. The conclusion summarizes the key findings and emphasizes the need for robust corporate governance and regulatory oversight. The report is supported by references to academic journals.