System and method for providing an on-site service

The present invention provides a system and method for providing an on-site service, said system containing a plurality of nodes, each node containing: a neighborhood node set generation module, used for generating a neighborhood node set on the basis of the bidirectional link bandwidth between a local node and a neighboring node; a neighborhood information index table generation module, used for generating a neighborhood information index table of the local node; a candidate service point selection module, used for selecting according to a selection function a candidate service node from the set of neighboring nodes; the definition of said selection function being: for a current service request, computing the difference between the QoS of the neighboring node i executing the service request and the QoS of the local node executing the service request; if the computed difference is smaller than a set threshold, the neighboring node i serving as the candidate service node; a service scheduling module, used for receiving status information and feedback information provided in real time by the candidate service node, and selecting, on the basis of this information, a candidate node or the local node to serve as the service-executing node.