The printing quality is decided by the ink system, which is heavy and complicated in offset press. Structure optimization and parameter modification is the key step of seeking better performance in the ink system. In this paper, the ink system of modern offset press was the research object, seeking the discrepancy of different structures and parameters. The surfaces of ink rollers and cylinders were discreted by computer simulation,based on this,established the math model of steady time in batch and continuous ink feeding system, then analysised the feeding system and vibration system. The simulation result indicates that the ink feeding system, the way of vibrator oscillation, plate coverage have great influence on the dynamic property. In batch ink feeding system, the property of ink system would be improved by increasing ductor roller swing frequency, and approached to continuous ink feeding system. On the machine with adjustable ductor roller swing frequency, the steady time would be reduced by regulating ductor roller swing frequency, improved efficiency with reducing paper wasting.