Aiming at the problem of more difficult and low efficiency to assembly 63PF2 conveying chain, the work measurement, action research and production line balancing method are studied, and the data of 63PF2 conveying chain assembly lines is obtained. Taking 63PF2 conveying chain assembly lines for example and using industrial engineering foundation of stopwatch time study, two-handed operation analysis, process flow analysis and quality management of fishbone diagram, the problems existing in 63PF2 conveying chain assembly process are analyzed. And then the work site preliminary optimization is carried out. The bottleneck process of assembly process is optimized and improved. And the balance of assembly line is optimized, so as to improve the transmission chain assembly efficiency.