Abstract: In order to manage Grid system in real time and adopt its dynamic changes, a workload monitoring infrastructure is proposed. The infrastructure classifies and establishes correlation for workload across components in Grid based on the Open Grid Service Architecture (OGSA) in an end-to-end manner. A Petri net model based on monitor point algorithm is constructed automatically to collect data of work units and provide monitor data information for users to explore. and manage system performance efficiently. On the base of the proposed infrastructure, some ideals to extend system function are put forward to satisfy the complexity of Grid and decrease communication delay and cost.