We designed a collaborative monitoring system based on JXTA. The system integrates P2P network technology with network management technology. We introduced the mechanism of JXTAs peer group, discussed the necessity of using a P2P network in a peer group application, presented the cooperative work scheme of P2P network, and emphasized the mechanism of peer group collaborative monitoring network when applying P2P network technology. The implementation method of the system was put forward by remotely monitoring the CISCO3640 port utilization ratio. The system features expansibility, usability, interoperability, high performance, decentralization, and robustness.