Online analytical processing (OLAP) system is the most important application of data warehouse system. It is specially used to support complex analytical operations, focusing on providing decision support for decision makers and senior managers. It can deal with complex queries with a large amount of data quickly and flexibly according to the requirements of analysts, and provide the query results to decision makers in an intuitive and easy-to-understand form, so that they can accurately grasp the operating conditions of enterprises (companies), understand the needs of objects and make correct plans.