This paper describes the building process of the warehouse platform on the e-commerce systems, including research the basic theory, the system design, the ETL design of data preprocessing, as well as the OLAP analysis. The last part is a data warehouse implementation within the electronic commerce system. The paper realizes the real-time data warehouse modeling on the web platform. ETL data processing is also achieved under the rules. Finally on the OLAP part, the result is displayed using graphical.