A large amount of data is often browsed in the Web application system, so the problem of data paging is bound to occur in the process of system development. ASP.NET offers many data paging approaches, but technically all using the synchronous transmission mode. Using this way to extract data causes the user waiting longer and heavier burden on the server. Based on the analysis of traditional data paging solution, through an example of browsing and querying student information, this paper introduces in detail implementation of data paging based on the Ajax technology in ASP.NET. The conclusion is that data paging based on the Ajax technology using asynchronous data transmission, when paging through updating local data, without reloading the whole page, greatly reduces the users' waiting time, lightens the burden of the server,and improves data query efficiency.