Abstract: This paper presents the results of numerical simulation for penetrating confined boron carbide with tungsten long-rod (L/D=20, L is the length, and D is the diameter of the tungsten long-rod) at impact velocity (v) from 1.5 to 5.0km/s. Simulation is carried out with the AUTODYN code and its results are in good agreement upon the experimental test. The influences of arithmetic, size of net and erosion strain on computing results are investigated. The expressions of penetration velocity (u), consumption velocity (v_c) and penetration depth (h) with impact velocity v are given in the end of the paper.