Abstract: When using the single image processing technique in detecting structure parameters of such fabrics as high density,skew or deformed,pile fabric and uneven structured,we are confronted with problems of measurement difficulty and low precision.Thus,this paper presents a new method developed for automatic measurement of yarn densities in fabrics.The method takes the advantage of a novel techique which combines the stretching & correcting in mechamcs,clarification,and image processing to measure yarn densities in fabrics quickly.The research verifies that the algorithm based on yarn densities image detection using combined technique is achieved easily,general applicable in image identification of fabric structure,so it can be used as an applied and standardized method.