The invention discloses a method for mobile phone business dynamic loading. The method includes: A, obtaining a client base which a user belongs to and/or limits of authority; and B, determining business to be loaded according to the client base and/or the limits of authority, and loading corresponding business in an internal memory of a mobile phone. Under the condition of limited internal memory of the mobile phone, dynamic loading business uses the internal memory of the mobile phone reasonably and improves reusability and operation stability of a program. In addition, an assembly manager and system for the mobile phone business dynamic loading is further disclosed.