In order to understand the influence of aspect ration and hitting attitude on limit penetration velocity of tungsten cylinder, on the basis of experimental research, 23g tungsten cylinders with different aspect ratio penetrating 10mm targets of the 40Cr and the shielded steel, the change of limit penetration velocity under different hitting attitude was studied by numerical simulation. The results show that aspect ratio and hitting attitude of the tungsten cylinders are important factors affecting limit penetration velocity. Under certain mass condition, hitting attitude has little influence on limit penetration velocity when aspect ratio of the tungsten cylinders is 0.8; Hitting attitude has great influence on limit penetration velocity when aspect ration is greater than 1.2. The study results have crucial guiding function on designs of fragment warhead.