Abstract: Perforation limit thickness of low carbon steel plates impacted normally by tungsten spheres was studied. Based on six-projectile test data analysis method, ballistic limit velocity and the range of perforation limit thickness were obtained by using tungsten spheres with Φ6.0 mm (93 W), Φ7.0 mm(93 W), Φ6.0 mm(95 W) and Φ7.5 mm(95 W) to impact Q235A steel plates with 6 different thicknesses. Numerical simulation with the same experimental conditions was conducted using Autodyn-3D software. After the reliability of simulation model was verified, perforation limit thickness range was obtained by simulation and the energy transformation rule of the penetration process was analyzed. The calculation model for perforation limit thicknesses of steel plates impacted normally by tungsten spheres was established based on the principle of energy conservation. The calculation results of the perforation limit thicknesses of Q235A steel plates struck normally by tungsten spheres with Φ6.0 mm (93 W),Φ7.0 mm(93 W),Φ6.0 mm(95 W) and Φ7.5 mm(95 W) were respectively 16.95, 19.17, 17.30 and 21.50 mm. The error between the experiment results and the range obtained from simulation analysis is no more than 10%. This research provides basic data and the method for the design of the kill element of blast-fragmentation warhead.