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The computational grid provides a promising platform for the efficient execution of complex real-time applications. Scheduling such applications is challenging because target resources are heterogeneous because their load and availability varies dynamically, and because the tasks have the strict timing constraints. In this paper, we proposed an dynamic real-time scheduling algorithm for real-time application running on the Grid. The scheduling model was organized in three levels: node scheduling, cluster scheduling and grid scheduling. This model fits for grid systems and it integrates local scheduling and global scheduling. This model looks like a hybrid model, but suits grid.