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Abstract: As the most beautiful and the most romantic curve, the cardioid is designed and#br# applied in arch dam for the first time. In researching the geometric characteristics of cardioid,#br# we find a length of very flat curve in it, which is suitable as the axle wire of arch dam, for it#br# can make the resultant force direction of arch dam deflect to the mountain. Therefore, it has a#br# certain applicable value to research cardioid as a new line type of arch dam. Based on#br# researching various parameters of cardioid dome dam, this article establishes mathematical#br# equations of cardioid dome dam, and adopts 3D modeling. It will provide an accurate model for#br# finite element analysis in next step. And it will also provide more selections and meaningful#br# reference for arch dam designing.#br# Key words: computer application; cardioid; axle wire; dome dam; 3D modeling