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By means of powerful capability of Surfer, in combination with Vb programming language, the ActiveX link can be set up. Calling the plotting functions of Surfer by Vb, the spotting, isoline plotting, and color filling of the town-level rainfall charts are realized automatically, as well as their dynamic display and export. The resulting rain charts can be overlapped with the rainfall enhancement operation sites, which can be embed into rain enhancement operating systems to provide useful reference for the determination of the appropriate operation time. The method can be also applied to other operational systems needing automatic plotting.