The comprehensive financial investment business entities system, which is introduced with the amendment of Financial Investment Services and Capital Markets Act on May 2013, has its major contents to allow the new business for large security firms in order to activate outstanding overseas investment banks such as Goldman Sachs, Merril Lynch, etc. Up to now, 4 years after the introduction of comprehensive financial investment business entities system, it is the general assessment that domestic security industry has not been far from the field of brokerage with insufficient features and competitiveness as an investment bank. Accordingly, this thesis has analyzed the legislative impacts of comprehensive financial investment business entities system for the period of past 4 years. First of all, when you consider that the designation system of comprehensive financial investment business entities has similar characteristics of business regulation such as licenses and permits, etc., it would be considered to be appropriate to regulate it as the approval system equally as a financial investment business. Furthermore, it may assess as the enlargement has been improved such as the increase of equity of comprehensive financial investment business entities, etc., but it may suggest that the activation of business of investment bank such as exclusive brokerage business and corporate credit offering, etc. has not been sufficient. Especially, the business and profit structure of security firm such as assets, liabilities, equity, net profit, etc., has been appeared to be promptly re-organized with the enlarged comprehensive financial investment business entities as the center. Upon the result of legislative impact analysis, there are positive effects with the introduction of comprehensive financial investment business entities system such as the increased scale of equity of security firm, etc. but on the contrary, there are negative effects such as the competitiveness and business foundation of small to medium security firms have been rapidly weakened, relatively. It suggests that this is a moment needed the corresponding policy for the improvement of competitiveness such the specialization, etc. of security firm in order to mitigate the polarization between the comprehensive financial investment business entities and the small to medium security firms along with the efforts