With the continuous development of science and technology, Internet technology has been quietly affect the mode of transmission, traditional web site information data is loaded only when the site page opens, when the page information needs to be updated, it can only be achieved by refreshing the page. In today's highly efficient information application environment, it has highlighted its problems, restricting the timeliness of information update. In this paper, the new HTML5 Internet programming language is combined with Ajax and SSE technology to study intelligent instant messaging and realize a new application mode.