A lot of idle and waiting time exists among some workstations in motorcycle packaging line. Aiming at this phenomenon, the bottle-neck section of packaging line was studied using MOD method. According to the principle of motion economy, the principles of ECRS and the theory of assembly line balance, a new scheme was put forward. Implementation of this new scheme makes the rate of production line balance upgrade 22. 2% and the cycle time decrease 5. 43 seconds.