Abstract: To overcome the deficiencies of existing quantitative analysis method of yarn, a new quantitative analysis method of yarn is developed depending on difference of fiber density. Practice has proved that this test method is simple, rapid, accurate, reliable and versatile. Since no harmful chemicals are used throughout the experiment, this test method avoids the operator’s physical hazards and environment pollution, so it has high application and popularization value.

Key words: yarn; quantitative analysis; density difference; dispersing medium; layer