For the multiple assembly line system composed by main line and feeder line,the influence of feeder line's cycle time and buffer capacity on output of main line was studied,and a method of optimizing feeder line was proposed.By regarding dynamic cycle time constraints and positional constraints,a mathematical model was established to minimize the buffer between main line and feeder line and the buffer between workstations of feeder line.A twostep-decoding genetic algorithm was used to solve the model.To mak...