Abstract: In the methods of current requirements prioritization, the user requirements arc compared and prioritized on the same level, and the hierarchy of requirements is few considered. This paper proposed a method of prioritizing re- quirements based on the combination of ISM and AHP. First, the hierarchical model of software requirements was built with ISM. Next, the requirements of top level of the model were prioritize by analytical hierarchy process. Final, the case analysis was given. The results show that this method can improve the rationality of the prioritizing requirements, and reduce the times of comparing requirements,and reduce the failure probability of the project.

Key words: Software project, Software requirement, Requirement priority, ISM technology, AHP method