Abstract: The internal relationship between the distance ease, material mechanical properties and ease allowance was expounded. Chief factors affect the appearance of a garment was analyzed, and mechanical properties of various fabrics and the real ease distribution relationship between body and garment were provided for 3-D garment simulation. 3-D scanner was used to measure the standard body and clouds data was obtained. On this basis, the distance eases between the body and the garment at typical cross sections (bust, waist and hip) from any angle can be computed in respect of fabrics with different physical properties. The distance ease distribution rule of various garments relative to different fabrics was analyzed. The correlation of the distance ease, material mechanical properties and ease allowance was discussed. The primary factors which affected distance eases were obtained using step-by-step regression and the functions were fitted.