To investigate the effects of projectile diameter and dislocation distance on the penetration depth and deflection behavior of subsequent projectiles during multi-projectile dislocated sequential penetration into a semi-infinite target， a theoretical model and numerical simulation model for the penetration depth of concrete targets under dislocated sequential penetration by multiple projectiles were established. tExperimental tests on multi-projectile dislocated sequential penetration were conducted to validate the reliability of the models. The results show that the penetration depth and deflection angles calculated from theoretical and numerical models agree well with experimental data， with maximum deviations of 6.7% and 9.0%， respectively. There exists a range of dislocation distances for multi-projectile penetration， where the lower limit L₁ represents the maximum dislocated distance at which subsequent projectiles deflect without entering the preceding projectile’s trajectory， and the upper limit L₂ denotes the minimum dislocated distance at which subsequent projectiles are almost unaffected by the preceding ones. Within this range， dislocated sequential penetration significantly enhances the penetration depth of subsequent projectiles， with preceding projectiles guide the trajectories of the subsequent ones. The influence of preceding projectiles on subsequent ones is negatively correlated with the dislocation distance. Under the condition where projcetiles penetrate a 80 MPa concrete target at a velocity of 600 m·s^-1， the penetration depth of the second 57mm projectile increases by approximately 30% compared to the first， while the third projectile’s penetration depth increases by up to 25% compared to the second. For projectiles with diameters of 57， 80， and 100 mm， the corresponding L₁ values are 2， 3， and 3.5 times the projectile diameter， respectively， and the L₂ values are 7， 10， and 14 times the diameter， respectively.