By increasing global competition, businesses have turned their efforts to create value for shareholders, in order to remain competitive. Accordingly, it is important for businesses to measure the created value for their shareholders. By protection the sequence value that created each year, businesses will be able to evaluate the past decisions and take decisions that create value for shareholders to improve value creation. Corporate governance defines as a motivation of business performance and a critical criteria for evaluating business unit and ensure reliability of financial and accounting reports. This paper invastigates the relationship between corporate governance and firm value in firms listed in tehran stock exchange. For our purpose, we collect the information from 1387-1392. Our result show that there is a significant positive relationship Between corporate governance and firm value (EVA). We also deduce that there is a significiant difference among the companies that have good corporate governance rating and that with weak one.