Recent accounting scandals at prominent companies such as Enron, Healthsouth, Tyco, and Worldcom abroad and Procomp technological, Rebar Group, PEWC in our country make the honest of firm’s principle doubt by investors. Information asymmetry between investors and management is becoming increasingly serious. The purpose of this study was to explore the difference between accounting-based economic added value and equity market-value-based created of shareholder value. As the same time we also explore the impact of corporate governance mechanisms on earnings management.