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The artificial hail suppression decision command system developed by the Dalian Weather Modification Office performed well in the practical operation in Dalian. A hail case on 7 June 2012 is used as an example, to introduce the functions and technical procedures of the system in real time hail suppression operation, including the system automatic identification of hail cloud initial echoes and types, and the quantitative output of operation alarm, decision making, and operation projects, as well as the real time operation commands, etc. Through system running and reasonable operation commanding, the hail cloud development was suppressed effectively, and the loss and waste of ammunition from blind operation were avoided. The system has been put into operation in Dalian presently.