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The monitoring service is a crucial component in the service oriented grid infrastructure. Objectives and requirements for the grid monitoring system have been summarized in this paper. To cope with the dynamic and large-scale nature of the grid, a scalable distributed monitoring system is proposed, which can support easy and rapid deployment of monitoring services in the grid environments. The BitTorrent protocol is adopted to facilitate the distribution and automated deployment of the monitoring system. The deployment of monitoring service for the newly joined node and the update of the deployed components can be initiated by the nodes within the system to reduce the administrator's participation. The maintenance cost and human errors might happen in the deployment process can be reduced. With the help of the peer-to-peer networks, our proposed system can automatically adapt to failures in network connections or nodes. Service capacity of our proposed system is given out. Simulation results show that our proposed system supports efficient and rapid deployment to a large scale grid and provides a robust platform to efficiently monitor the grid resources.