Abstract: Applying 45°bias cut to shift the three statistics of original models of plane cut dresses,the bias cut dress models can be established.First,the waistline is shifted,including the shift of hip and waist discrepancy as well as the shift of placket hold.Their sizes must be kept equal to those before the shift.Second,the hip length is shifted so that the hip length of the bias cut is equal or close to that of the original models and on the same level.Third,the skirt line is shifted so that the skirt line of the bias cut is close to that of the original models on the same level.To make an accurate shift of the waistline,the hip length and the skirt line is the key research content of bias cut dress models.By analyzing the examples of applied two-piece bias cut dresses,most variations of designs of the bias cut dresses are reflected in the pieces of bias material and the skirt line molding choices.