Abstract: A mathematical model of dynamic pressure in a mould flux channel was established, and the pressure fluctuation rule was simulated. The effects of mould flux channel shape parameters, continuous casting technical parameters and mould flux viscosity on the pressure were researched. The results indicate that the flux channel pressure comes to the negative maximum and positive maximum when the mould oscillation velocity reaches the maximum upward velocity and the maximum downward velocity, respectively. The parameters of mould flux channel shape have important effect on the pressure. Both the positive pressure and negative pressure are depressed greatly with the increases of flux channel entrance and exit widths. But the increase of flux channel length makes the pressure large. Both the withdrawal speed and mould oscillation velocity influence the flux channel pressure. With increasing withdrawal speed, the maximum of negative pressure is enlarged, while the maximum of positive pressure is depressed. The increases of mould oscillation velocity and flux viscosity make the maximums of positive pressure and negative pressure enhanced.