This study aimed to clarifying the methods and mechanisms of financing the MSMEs in Algeria. As one of the tributaries of the economic and social development in general. Through this research paper, we have discussed the support mechanisms and incentive systems for investment. Which is the National Unemployment Insurance Fund, the National Agency for Youth Employment Support, and the National Agency for Small Loans Management. Also, highlighting the role that these institutions play in accompanying investors. Especially young people that have a project ideas, which let them to create institutions, as these accompanying bodies guarantee at all stages of creating or expanding the institution. The study concluded that the support and accompaniment agencies contributed greatly to the establishment of MSMEs enterprises. As a result of serious accompaniment, from the idea to the goal of embodying the project through financial support and tax benefits. During the completion and exploitation stages. (Bank loans, tax and semi-tax exemptions and discounts ...)