Abstract: While software play more critical roles in business, the quality of financial software systems become extremely important as the enterprises rely more on their software applications. Incremental software development enables the development team to yield the functionalities step by step so as to satisfy the changing business requirement and enable the high quality releases as well. However, efficient quality management is essential to make the best tradeoff between schedule, effort, cost and quality so as to reduce the potential risks in the business. In this study, the authors suggest a continuous quality improvement framework on the basis of quantitative quality evaluation in incremental financial software development. A set of evaluation, analysis and improvement approaches are described and designed. Related practice in a global IT corporation shows that the approaches have significant business value to support the best tradeoff making.