Preconditions of Kanban Leveling production: .Multi-product mix production; .Smooth and balanced production; Balanced not only in yield,but also in product mix,time and load. .In order to reduce inventory level of final products. Example:25 days in May and 7h of working time every day. Product Demand Output/day Takt Time (min) A 400 16 26.2 B 300 12 35 C 200 8 52.5 D 100 4 105 Sum 1000 40 10.5 上泽充道大姿Preconditions of Kanban Example：25 days in May and 7h of working time every day. Leveling production: •Multi-product mix production; •Smooth and balanced production; •Balanced not only in yield, but also in product mix, time and load. •In order to reduce inventory level of final products. Product Demand Output/day Takt Time (min) A 400 16 26.2 B 300 12 35 C 200 8 52.5 D 100 4 105 Sum 1000 40 10.5