To study the effects of the thickness of ceramic and the 3D-confinement on the performance of ceramic composite target against medium caliber projectile,three kinds of ceramic composite targets were designed.The damage characteristics of the targets,the erosion behaviors of projectiles and the penetration process based on the high speed photograph(HSP) were investigated with ballistic tests of 30 mm projectiles.Based on numerical simulation,the influencecs of ceramic thickness and confinement on the limit velocities and ballistic mechanisms of the targets were analyzed.When the area of composite target is small,the ceramic thickness and confinement are important factors affecting the ballistic performance.Increase in ceramic thickness and 3D-confinement can effectively improve the ballistic performance of targets.