Abstract: In this paper the behavior of collision between inclusions in molten steel and refractory wall when the molten steel flows through the continuous casting nozzle had been investigated and thenthe model of collision between inclusions had been developed.It is found out that when the coefficient of restitution is constant,inclusions of same sizes collide with the wall. the greater the velocity of inclusion on the vertical wall direction,the greater the maximum compression distance and the greater the springback distance,and the inclusions easily rebound into molten steel after the collision.When the coefficient of restitution and the initial velocity of inclusions are constant,inclusions of different sizes collide with the wall,,maximum compression distance and t the springback distance decrease with the size of the inclusion decreasing,therefore,inclusions are easily attached to the refractory wall after the collision. When Al₂O₃ inclusions with a radius of 20 μm collides with inclusions attachingwith a smooth wall,and the velocity of inclusions are constant,critical contact size of the inclusion attached to the refractory wall increases with the compression distance,resulting in high frequency of falling off or rolling of the inclusion are attached to the refractory wall.These inclusions collides with inclusions attached with a rough wall,when the angle between the direction of inclusions and the direction of the parallel wall is greater than 0.51°,the inclusion attached to the refractory wall will not fall off and roll.The results of the analysis are of significance to the study of adsorption of inclusions in molten steel by refractory wall in the continuous casting nozzle.