Blogger is a new on-line service emerging in the booming Internet. It's also a new way of live social network just the same as E-mail,Forum,Instant Messenger. As more and more users join in, blogger, as a new way of life style, work style and learning style has obtained increasing popolarity and meantime changed the traditional virtual and social structure. This paper conducts a research on the general principle and basic rules followed by the blogger websites with the help of ASP.NET technology taking the B/S as the structural pattern.The system takes ASP.NET、Ajax、SQL Server 2008 as the database technology with the guidance of Software Engineering Theology. It mainly consists of requirements analysis,overall degisn,detailed design and test and maintance.The biggest feature of this paper is that it takes the classic three-tier architecture aiming to solve the drawback of traditional blogging system. In detail, the three-tier architecture divides the overall system into three sections, database access layer, operation logic layer and user behavior layer. By intruducing the MVC pattern, the blogger web can be managed in a more dynamic and efficient way. Besides, it also adds the instant Chant function and due to application of the Ajax technology the chat window can be updated automatically, a big feature different from other systems.