In 2008, IASB and FASB jointly published ‘Discussion Paper Preliminary Views on Financial Statement Presentation(DP) ', which proposes to classify an enterprise's activities into three categories : operating, investing and financing. This paper tests the effect of this reform from the aspect of financial analysis by applying the new analysis system which is on the basis of the improved presentation format to the financial statements of PetroChina and Sinopec, and compares with the DuPont Analysis based on the financial statement used today. The result shows that the improved presentation model provides more decision - useful information. However, DP introduces more management intention and discretion, which will strongly increase the complexity of report preparation and the challenge for CPA, and the cost of accounting system reform also can not be neglected, so we suppose that it is not appropriate to change DP into accounting standards at least at present. Nevertheless, the classification idea can be a good reference to the internal financial analysis for enterprise groups.