This paper provides a novel finite state based network service model

which takes the finite state mobile agent (FS-Agent) as the fundamental service unit.In this model

the service content is described by a service content finite state machine (Content-FS)

and the service computing process is depicted by a service computation model

which is defined as a mobile agent computation model based on finite state (MACM-FS).Therefore we construct a content-based service model prior to those based on traditional techniques.The experiment results demonstrate that the model is more scalable and effective.