Abstract: Breast is the only organ in the body that is without the bones. Due to the physical force in the daily life(the gravity and body movement), women need well-structure-designed brassieres to give the easy-saged breast enough and proper lift force, thus to make sure the breasts can keep or be corrected beautiful. Because of the social culture, race, trophic structure and other factors, the forms, shapes, positions of the breast and the awareness of its beauty varies from country to country, so breasts of different forms need brassieres of different structures. These brassieres’ structures show the different pattern designs. By summarizing the categories of women’s breast forms, analyzing brassiere shapes’ features and breast forms they apply to, and doing some certain experiments to delve deep into the pattern design of deviated flat breast forms, and provide the technological explanation to the brassieres correcting treatment.