This paper investigates whether hiring Big-4 auditor could mitigate the agency problem and alleviate the conflicts between manager and share/debt holders, not just serves as a bonding mechanism of corporate governance. The data will be collected from 6 emerging markets during 2002 to 2008 in Eastern Asia where the agency problem is more severe than other developed countries. We want to test whether Big-4 auditors can mitigate agency cost or it is just a governance bonding mechanism in law. This paper further proves that after employing Big-4 auditors, the firm value measured by ROA, TOBINS’Q and SALES will be improved.