Abstarct: Buried structures on the soil, which can be used as a safe structure, have an irrefutable role in the discussion of non-operating defense. One of the dangers that threatens these types of structures is the impact of their projectiles and crackdowns and their penetration. Awareness and understanding of the complex subject of the projectile's encounter with various goals has been a matter of interest to researchers and civil engineers. Military applications such as the design of propellant-resistant structures, the design of protective coatings are among the most important applications of this discussion. Investigating the phenomenon of collision and penetration due to the effectiveness of various parameters such as heat transfer and mass transfer, friction, the impact of object geometry and other very complicated cases, has many problems and problems. Investigating the effects of projectile encounter in the past has been carried out by various experiments, but these experiments have determined relative and approximate projectile behavior due to the limitation of facilities and the provision of test conditions. Therefore, the importance of this issue has led to the study of the projectile penetration in sandy soils in numerical order. Analysis of issues with boundaries with constant deformation during problem solving is weak using a network-baxsed method. To solve this problem, commonly used non-networking methods. One of these methods, which is particularly suitable for impact, penetration and failure problems, is the particle hydrodynamic method. In the current research, the penetration of a sharp conical projectile in sandy and clay soil was investigated. in which the effects of projectile types and soil density have been investigated. For modeling, the method without SPH network has been used, and the velocity and displacement graphs of the projectiles have been compared. The results of comparing these graphs show that the penetration of the projectile decreases with the increase of soil density and the increase of soil adhesion.