Weight control runs through the entire life cycle of civil aircraft from design, manufacturing to operation. Though the pacing factor of aircraft's weight majorly stays in the link of design, in the view of the experience of domestic and foreign manufacturers, it still has optimization in the stage of aircraft mass production. This article generalizes the lightening experience of domestic and foreign manufacturers during the manufacturing of aircrafts, while majorly representing MWAP（Manufacturing Weight Awareness Process） during the manufacturing of Boeing as an expected heuristics.