The Manufacturing Grid domain is characterized by rapid and substantial change over
time. The entire process of product development can be quite complex. The activities are expected to
be executed on heterogeneous resources which are geographically distributed. However, traditional
modeling systems use static workflow models which can not automatically redesign the business
process and mask the isomerism of the resources. In this article, an open and extensible framework of
MG workflow is given, which complies with the standard of WFMC and GGF. A formalized
definition workflow model is proposed including process model, organization model, resource
model, and service mode. The integrated workflow model can be used to dynamically represent a
business process and other aspect s of Manufacturing Grid workflow.