The plasma sprayed tungsten coatings were prepared on oxygen free copper substrates, which are to be used as the plasma-facing materials of the divergent components in fusion reactors. The influences of different interlayers on bonding strengths of the plasma-sprayed tungsten coatings were compared. The morphologies and compositions of the coatings were observed and analysed by SEM, EDS. It was found that the bond between copper and the coating was relatively loose, and the bond between tungsten and the coating was relatively dense. Tensile tests indicated that the tungsten coating without any interlayer showed higher bonding strength than that of the other specimens.