The multi carbide composite cladding layers with different Co contents were prepared by fluxcored wire arc welding. The microstructure of the cladding layer was composed of M7（C, B）3, M3（C, B） carbide, martensite and a small amount of retained austenite（M = Cr, Fe, Mn, Co, etc.）. With the increase of Co content, the amount and size of austenite dendrite was increased. After high temperature tempering（600 ℃× 4 h）, the primary M7（C, B）3 carbides and eutectic M3（C, B） carbides didn’t change obviously, but the color austenite turned gray black, which indicated that austenite was oxidized. Moreover, the high temperature tempering stability of multi carbide composite cladding layer was increased gradually. In addition, when the Co content is 6%, the best high temperature wear resistance of the multi-component carbide composite cladding layer was closely related to the highest hardness and good high-temperature tempering stability of the multi-component composite cladding layer.