Abstract: A trilaminated composite with a steel basis, a transitionlayer of powder copper and a surface layer of POM has been introduced in this essay. The process technology of the trilaminated composites and its influence on the property have been studied. The result shows that, in a certain temperature range, the surface hardness of the products increases with the increasing processing temperature, and decreases with the thickness of the plastic layer increased. Larger composite force of the plastic layer and steel basis, larger surface hardness and less friction coefficient of the products have been shown in larger size of the powder copper.