Laser-aided direct metal deposition (LADMD) technique was used to fabricate Co-285+WC coatings on 1018 mild steels. The effects of the processing parameters (laser power P, addition amount of WC, scanning speed V) on the microhardness of the deposited coatings was analyzed. Results indicate that the microhardness of the matrix and the Rockwell hardness of the deposited coatings increases with the addition of WC and the P/V value. The addition amount of WC has the most important effect on the two hardness values, followed by the scanning speed and the laser power. Results of the optimized specimen in this study indicate that the deposited coating is composed of undissolved WC, dendrites, eutectics and the coral structures. The wear mechanism of the deposited coating is a mixture of abrasive, adhesive and oxidation wear.