This paper investigates the relative effect of each ISO 9001 : 2000 quality management system's requirement and business performance. The empirical tests are conducted in ISO 9001 certification companies. As a result, the 1^st, it shows the requirements positively affect performance of financial. The 2^nd, also it shows the requirements positively affect non-financial performance. The 3^rd also it show the non-financial performance positively effect performance of financial performance.