The characters of contact friction of particle material are quite complexness. Considering normal non-elasticity contact as damage through contact, according to continuous damage theory, and based on the reasonable assumption, the damage variable of particle material was defined and the corresponding damage evaluation equation was created. Combined with Lemaitre equivalent strain assumption, the effects of particle material damage through contact on characters of friction contact were studied. 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 considering damage through contact