Abstract: In the non-contact body measurement system,how to obtain the bust size is a pivotal problem.Based on the photographic measurement method,this paper brought forward some fitting problems existing in human bust girth.And by using of photographic measurement data,the formula of young lady′s bust girth could be deduced by correlation analysis and regression analysis.The work has got good effect in forecasting through experiment of sample dress,laying a foundation for realization of the non-contact body measurement system.