The fluid dynamics of the multiphase flow induced by water entry of high speed projectiles with various heads are different. Numerical simulation for modeling the high-speed water entry problem of projectiles with different heads at an initial impact velocity was performed. Finite Volume Method was introduced to solve the Reynolds Averaged Navier-Stokes equations, and the motion of the projectiles and cavity formation were obtained. The results showed that the cavity radius was related to the angle and the drag coefficient of the cone heads. The distribution of pressure coefficient on the cone and velocity around the shoulder of the projectiles were also obtained. During the initial stage of the water entry, there will be an extremely high pressure load. When the angle of the cone head is larger, the pressure gets higher, the pressure coefficient is larger, and the velocity of the water which is arranged by the projectile is higher.