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The design of a parallel debugger is indispensable and yet still challenging in developing tools for parallel environments. This paper focuses on the design and implementation of an actual parallel debugger, which has been realized on clusters is of a typical browser/server structure. A friendly user interface is provided, which visualizes the tedious process of debugging, The user interfaces, as clients, can be distributed far away from the server, which makes it easy for the client end to execute programs on the server machine. The task management module on debugging nodes, receiving debugging commands and sending results.