Abstract: In order to improve the performance of the shield without increasing its weight or size,an N-shape configuration with an oblique middle wall is proposed in the study based on the fact that the ballistic limit of oblique impact is higher than that of normal impact.The perform-ance of the N-shape configuration and a parallel triple-wall configuration with the same areal den-sity are compared and analyzed by 3D numerical simulation (SPH )and hypervelocity impact tests.The hypervelocity impact tests under different impact conditions have been carried on.The test results,which are achieved under the condition that the diameter of projectile in the normal impact is 4.0mm and the impact velocity is about 3.0km/s,indicat that there is little difference of damage on rear plates between the two configurations.In another normal impact test with a projectile diameter of 5.5mm and an impact velocity of 4.8km/s,the damage difference become considerable,and there is a perforation with a diameter of 2.0mm in the rear plate of the triple-wall configuration but no perforation happens to the rear plate of the N-shape configuration under the same condition.Simulation with the same impact parameters as the tests is carried out.The results show that the critical proj ectile diameter of the triple-wall configuration is about 4 .1 mm and that of N-shape configuration is about 4.3mm,when the velocity of the normal impact is 3.0 km/s.The critical projectile diameter of triple-wall configuration is about 5.5mm and that of N-shape configuration is about 5.9mm under the normal impact with a velocity of 4. 8km/s.The simulation results are in accordance with the test results.These results showed that the perform-ance of N-shape configuration is improved by the oblique middle wall under the condition of nor-mal impact espercially with a higher velocity.