Project Manufacturing has both project features and the nature of manufacturing, and these two aspects decide that the business of project manufacturing enterprise is different from others. Especially in a complex products structure and mass production environments, the business has great impact on ERP system. Currently，the functions of ERP software have many shortcomings in satisfying the project manufacturing requirement, so it has to be customized in ERP implementation process, which caused a large number of duplication work in enterprise ERP projects. This article first goes through a typical project manufacturing companies to find out business problems, and next analyzes the special business requirement of project manufacturing. Finally, it matches one of the most advanced ERP software, Oracle EBS with the business requirements, finding out the shortcomings of ERP in supporting project manufacturing business and providing some reference to continuous improvement of ERP.