Workflow technology has been a new hotspot in the area of computer application since 1990. It is very important to study the technology in-depth, since it can significantly improve the information standard and operation efficiency of enterprises, hence make them more competitive. In this paper, the evolution of workflow technology is introduced. After that, the current situation of research in workflow area is overviewed, including workflow definition, workflow model, workflow implementation technology, and workflow transaction management. The limitations of current workflow technology and the reasons that cause them are also pointed out. Finally, the conclusions and the future trends of workflow study are given.