The article with the topic of "Investigation of financial constraints: models and solutions" examines the concept of financial constraints, its causes and consequences, and different models for managing and controlling financial constraints. In this research, the literature related to financial constraints, models and solutions and its causes and consequences and different models for managing and controlling financial constraints are examined by studying and reviewing domestic and foreign articles; Therefore, the research method is a review. In this article, the concept of financial limitation and its types have been explained first. Then, the causes and consequences of financial constraints for organizations and the person who experiences it have been investigated. In the following, various indicators and criteria and models for managing and controlling financial restrictions have been introduced. For each of these models, solutions are provided to improve the financial situation of organizations. Finally, the article has come to the conclusion that financial constraints arise due to several internal and external factors, including market fluctuations, changes in laws and regulations, etc. To manage and control financial constraints, choosing the right model for each organization and implementing the solutions provided in that model can improve the organization's financial situation and reduce the negative effects of financial constraints.