E-Manufacturing is a new manufacturing concept under current situation. It is the effective enterprise technologies of integrating all kinds of heterogeneous systems from plant floor sources to suppliers and customers by electronic and Web technologies. To achieve this, it needs an information-supporting platform called e-Manufacturing Information Integration Platform, which are the solution facing services. It utilizes Web Services to encapsulate the functions of the basic information systems of manufacturing companies. Those functions become the e-Manufacturing nodes and these e-Manufacturing nodes form an integration platform. At the end, a reference modeling of open e-Manufacturing Integration Platform based on the web services technology is presented. The core concepts of e-Manufacturing Integration Platform are shown. At the same time, the key technologies and implements are researched.