Understanding the correct way to determine the financing package for infrastructure projects, identifying proper processes, resources, techniques, and instruments to realize successful financing approaches, and private sector participation in providing development infrastructures are irrefutable. The main purpose of this study is to present a comprehensive model covering these complex issues. To this end, using the library studies, receiving expert opinion, and recognizing international financing processes, information was gathered on this subject; therefore, in this paper, the model of designing financing package for infrastructure projects is processed and identified, and designing the financing structure is closely related to the ownership structure of the project and its guaranteed package. These will change in a repeatable process until the end of the preparation phase and sometimes in project steps. The ownership of the infrastructure projects is determined by this repeatable process, which defines initial sponsors, costs, and benefits for partners, types of financial instruments, and techniques and evaluates risks and capital structure. In this paper, we suggest a model to help practitioners more effectively and systematically finance infrastructures. The development of guidelines and information resources in this field is one of the effective measures to build capacity and eliminate possible ambiguities and misunderstandings about public-private partnership.