Abstract: The investigation on crater depth can improve the calculation precision of penetration depth and overload. Firstly, a new crater depth model which considered projectile weight and initial velocity was established through the summary and comparison of existing crater depth models and the regression analysis of experimental data. Then, the crater depth calculation method of projectile penetrating into reinforced concrete target was proposed on this basis. Finally, combined with the dynamic spherical cavity expansion theory in reinforced concrete established by the authors earlier, the new crater model was used and analyzed based on the experimental data from references. This model considers projectile weight, initial velocity and laying depth of the first layer of reinforced mesh, and it can be used to predict the crater depths of projectiles with different weights and different initial velocities penetrating into reinforced concrete targets. Especially, this model provides a basis for predicting crater depth of large mass projectile and reinforced concrete.