Abstract: By employing the finite element method, and in combination with the process of functionally gradient materials, the transient pressure within metal/ceramic particles impacting onto a substrate is studied. The results show that the transient pressure, both in the impacting front elements and for the whole particle, involves a vibrating and damping tendency, the axial velocity decreases with the increase of the radial velocity, the particle viscosity does not significantly affect the pressure and the pressure peak value follows a direct ratio relationship with the particle density and the square of initial velocity. This work will be helpful in understanding the mechanism of the formation of coatings, and is thus of benefit in the processing of functional gradient materials.