Abstract: Carding is one important step in processing line of jute spinning. The cylinder is the heart of the whole machine due to the carding action, which causes from its cylinder speed and other rollers. This action mainly occurs in breaker card machine. This study was carried out to find out the effectiveness of various speeds of breaker card cylinder on fibre length and quality of jute yarn 276 tex (8 lbs./spy). Medium speed of the brake card cylinder was better than any other speeds for good fibre length and quality of jute yarn.