Abstract: In order to investigate the relationships among circumference, weight, hardness and draw resistance, the filter rods of different circumferences and weights made of 2.7Y/30000, 3.0Y/35000 and 3.3Y/37000 tows without plasticizer were tested. The results showed that 1) for the filter rod made of 2.7Y/30000 acetate tow, the draw resistance and hardness changed by 83Pa, 0.43% and 116Pa, 1.18%, respectively; 2) for the filter rod made of 3.0 Y/35000 tow, the draw resistance and hardness of filter rod were varied by 74Pa and 0.49% and by 114pa and 0.88%, respectively; 3) for the filter rod made of 3.3Y/37000 tow, the changes of draw resistance and hardness were 77Pa, 0.53% and 109Pa, 1.31%, respectively; when the circumference and weight of filter rod varied 0.1mm and 0.01g, respectively.