Abstract: This paper presents a parametric method for 3D garment design. Based on the features of the human body and garment, we present a concept of garment geometric elements, with the spline curve as its basic element. Three relations, same-point, symmetry and self-symmetry are firstly introduced as the constraints of garment geometric elements, then a constraint graph is established, to describes the relations of garment geometric elements. Finally, parametric design of 3D garment is realized by resolving the constraint relations. This study extends parametric methods to high-level entities including the spline curve and mesh. The method has been successfully applied in a 3D garment design system.