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There are many risk items of the project development that cause the process maturity level occurring in the quality problems during process management and project progress. This paper designs the opportunity tree that level-up the current environments and their problems solution as well. For the similar projects, we can estimate defects and prepare to solve them by using domain expert knowledge and the opportunity tree, which can greatly improve the software process. And this paper reference ISO/IEC 15504 as the international standard. Also, this paper is intended to develop the relationship between process improvement and their causes to introduce. Therefore, using defect causes, we understand the associated relationship between AHP and design opportunity tree to level-up.