The three-dimensional fabrics have drawn much attention in the recent years and are used in different industries. So, study of the physical properties and mechanical behavior of these fabrics are important. One of the most important properties of spacer fabrics is their reactionary properties. So, one of the most important application of these type of fabrics is using as a protector from impulsive forces. Nowadays, modeling of the relationship between structural parameters and textile properties as well as prediction of their properties by using these models has received considerable attention by researchers. In this research, with due attention to the magnitude to the behavior of three-dimensional fabrics to applied impulsive forces in application at various industries, a model have been provided for prediction the behavior of these fabrics to damp the resulting force of impact. Because of the reactionary property of spacer fabrics, a mechanical model containing lumped mass and spring has been used for studying the vibrating behavior of spacer layers due to impulse. Viscous damping occurs in a mechanical system because of friction which is usually due to drag or internal forces. So, a mechanical device called a dashpot has been added to the system for producing the damping force. The study of vibrations begins with the mathematical modeling of vibrating systems. Mathematical modeling of vibrations problems leads to differential equations with constant coefficients. At the model that has been used for spacer layers, there are the mass, stiffness and damping constants. By solving the resulting equations, the displacement of the system has been obtained as a dependent variable that is function of the time independent variable and shows the mechanical behavior of the system. Eventually, by application of the second low of Newton , the resulting force of impulse has been calculated as function of time.