The characters of friction contact in particle material were quite complexness. Non-elasticity contact in normal regard as damage through contact, according to continuous damage theory, based on the reasonable assumption, we defined the damage variable of particle material and created the corresponding damage evaluation equation. Combined with Lemaitre equivalent strain assumption, we researched on the effecting of particle material damage through contact on characters of friction contact. The results indicated that the damage through contact model of particle material can predict the character of normal pressure-contact deformation. Normal stress on contact area is easy curve and contact area exaggeration when damage through contact has been considered. The characters of tangential micro-displacement can be predicted by considered damage through contact.
