Abstarct: In Iran, start-up companies are increasing, and their most important problem is the issue of financing, so here, by considering a dynamic model for crowdfunding, support for knowledge-baxsed start-up companies in Iran is discussed. If the start-up companies want to use traditional methods to secure financial resources during the start-up and in the initial stages of formation, they will face many problems, including receiving a bank loan and facing its difficult conditions, using risky capital; Therefore, these companies can get the capital they need by using crowdfunding models. In this regard, platforms have been developed with the aim of choosing the method of providing collective financial resources. Capital seekers (business owners) and investors will be present on this platform. They will enter information about their products to be introduced on the platform so that investors can choose and invest by viewing this information. crowdfunding in addition to financial benefits for business owners; It brings other non-financial benefits, such as saving time in providing and receiving services, receiving customer opinions, and community awareness of the product and service that can be provided. In this system, an attempt is made to check the optimal pricing and design of product sales to maximize the profit of business owners. The sale and presentation of the product can be defined in the form of a one-stage or two-stage plan. The purpose of this research is to design a comprehensive model for crowdfunding in order to support start-up companies in the field of information technology in Iran baxsed on the approach of dynamic systems analysis. For this purpose, the cause and effect diagrams and then the flow have been implemented and analyzed in the platform of Vansim software. The results obtained from the model simulation showed; Since the reward model is more compatible with business plans in the field of information technology, it will expand further; Likewise, the development of legal requirements and protections in platforms and their more monitoring will improve the quality of business plans and, as a result, the success of financing campaigns.