Offset printing process has multi-colour group and multi-function roll paper and flat paper machine. The former has a high production speed and is suitable for pre-printing cartons with large batches and fixed product structure. After surface paper printing, it can be directly laminated and bonded with corrugated cardboard on corrugated production line. The printing speed of the latter can reach about 10,000 sheets per hour, which is suitable for carton products produced in medium and small batches. The printing specifications of face paper can be flexible and changeable. Flat paper machine can also print fine corrugated cardboard directly.