This paper integrates search engine with Cloud Computing, introduces a user interest model on the premise of the advantages of the two above and through analysis of search demands of users, and push results obtained through cloud search and close to demands to users immediately by existing server push technology. It shows through experiment that the search engine under Cloud Computing can express the search demands of users more greatly, compared with traditional search engine, the realization of information push makes that users can get relevant information in time, the search based user interest model under Cloud Computing provides users with a better search mode.