Abstract: To make the bra pattern-design more normative and scientific,on the basis of 3-D body scanning,through measuring 102 women′s breast′s main minute-part characteristic dimensions,whose breasts are correspondingly ideal,and in combination with the character of bra′s pattern-design in the undergarment factories,this paper has found the body foundation of major part-dimensions in the pattern-design,and analyzed the relation between their breast′s minute-part characteristic dimensions and main manipulative sizes in pattern design of bra.SPSS software was used to build regression equations of part-dimensions in the pattern-design about breast circumference,under-breast circumference and the difference between them