The mechanical properties of jean slacks to the type of cutting lines in knee region and the bending time, after doing bending 0 times, 500 times, and 1500 times, the effects of whether or not cutting line, the fabric direction of the cutting area, and the number of cutting lines were investigated for tensile, shearing, compression, and mixing value of mechanical properties. The results are as follows: EM to bending times were larger in order of weft <wp/wf 1<wp/wp 1<warp<wp/wf <wp/wp 2<bias. G to bending times were influenced by the number of cutting lines to the shearing which entails tensile property more than bi-axel. Regardless of fabric direction, the sample of 2 cutting line showed very lower G than 1 cutting line sample. WC to bending times were larger for wp/wp1 sample than other samples. RC to bending times decreased for 1 cutting line sample but increased continuously for 2 cutting line sample except at the times of 1000. 2HG/G, the combination of mechanical properties decreased as bending times increased. W/T were small 1 cutting line sample, both before and after bending. As to shrinking of cut area after 1500 time bending, wp/wf 1 sample showed larger shrinking in weft than in warp. The shrinking of wp/wf 2 sample were larger in weft. wp/wp 1 and wp/wp 2 samples showed equal shrinking in warp and weft.