In order to improve the wear resistance and high-temperature oxidation resistance of materials surface, MoFeCrTiWSi_xAl_y (x=0 or 1 and y=0 or 1) high-entropy alloy coatings, named MoFeCrTiWSixAly high-entropy alloy (HEA) coatings, are fabricated on Q235 steel by laser cladding. The effect of silicon and aluminum on the microstructure, phases, wear resistance and high- temperature oxidation resistance are researched by X- ray diffraction (XRD), scanning electron microscopy (SEM) and wear tester. The results show that the main phase of MoFeCrTiWSi_xAl_y HEA coatings is BCC structure. With the addition of silicon and aluminum, the lattice constants of BCC structure are all reduced. When x=0 and y=1, the coating is composed of single BCC structure, its microstructure is fine dendrites, but its wear resistance is lower. When x=1 and y=0 or 1, there is few intermetallic compound in the coatings and its wear resistance increases. MoFeCrTiWSi_xAl_y HEA coatings exhibit higher oxidation resistance at 800 ℃. Adding silicon and aluminum into coatings can further improve the high-temperature oxidation of coatings.