For combed spun yarn of high quality, the feed amount per cycle and the bat weight have to be chosen correctly. When the feed amount per cycle and the bat weight are too low or too great, there is an effect on the combing efficiency, piecing quality, percentage of noil and quality of spun yarn. The influence of the feed amount per cycle and the bat weigh on combing efficiency, percentage of noil and piecing quality are analyzed theoretically. In order to investigate the effects of the feed amount per cycle and the bat weight on yarn quality (unevenness CV%, thin places, thick places and neps), The 14.6 tex yarn is spun on combing spinning system with E62 comber. The results of our investigations reveal that high combing efficiency and high quality yarn can be obtained with a lesser feed amount per cycle and a bigger bat weight on new type of cotton comber.