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It is important that the business logic need to be perfected when developing the new system, after understanding the functions of the system requirements of navigational mark business management system based on .NET. In order to achieve the reuse of business models and better meet the changing needs of users, the new system implements the business logical multi-tier architecture with MVC design pattern, adopting the interface-oriented and the factory mode design theory. The new system has some advantages of clear structure, portability, good compatibility, high efficiency, easy maintenance. Practice proves that the proposed business logical multi-layer system architectural based on .NET Framework has important practical value and guiding significance for the development of navigational mark business in the new system.