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According to the requirement of the cultural relic protection project,this paper mainly researches cultural relic virtual restoration using 3D fine model.We present a novel method for finding relics restoration evidence base on regression model and restore them using 3D models.The method is efficacious verified by an example of DaZu Thousand-Hand Bodhisattva rock carving.We successful estimate the defect length of Bodhisattva hands via regression equation.