The Geometer's Sketchpad is an outstanding specialized platform software ,representing the developing trend of contemporary specialized tool platform .Based on mathematics ,it show s the thoughts of designers through "the dynamic geometry",supplying a new tool to explore the geometry mystery to us .T he article attempts to tell us how to create user -defined tools through specific example of "Geom-eter's Sketchpad".%几何画板是一个优秀的专业学科平台软件，代表了当代专业工具平台类教学软件的发展方向。它以数学为根本，以“动态几何”为特色来动态表现设计者的思想，为我们探索几何奥秘提供一个新的工具。文章通过具体实例介绍在“几何画板”中如何创建自定义工具。
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