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Distributed resource monitoring system is the core component of grid platforms, and also a key technology to grid application development. However, most of the traditional monitoring systems, either single centralized or hierarchical, have significant limitations in scalability, extensibility and fault-tolerance. Based on GMA (Grid Monitoring Architecture), Coequal Multi-Monitoring Technique (CMMT) was proposed. The mechanisms and implementation of coequal monitor management, coequal monitoring and coequal monitor cooperation were discussed. Preliminary experimental results showed that system above is scalable and extensible to overcome the problems within the grid monitoring system.