For the problem of service publishing and discovery in traditional centralized mechanism and that of service workflow binding static service at flow design stage, this paper proposes a method of using service classification based 3-layer chord to organize services and the model of logical workflow interacting with resource layer. Web service classification model is introduced first. Then, structured p2p resource layer is modeled, and the method of logical workflow definition is introduced. Finally, four functional modules including process matching, service discovery, service selecting and service binding to realize the mapping from logical workflow to executable workflow are designed.