The effects of alloying elements on the surface microstructure formed by lithium added salt-bath nitrocarburizing were investigated. Alloys used in this study were Fe-0.4％C alloy and ones containing Si, V, Cr Mn and Mo independently. An oxide layer, followed by a compound layer and a nitrogen diffusion layer are formed on the surface in all alloys after oxy-nitrocarburizing at 823 K for 1.0 h. The oxide layer consists of Li_xFe_1-xO which is same as binary alloy when V, Mn or Mo is added. However, by Si or Cr addition an oxide layer is divided into two layers which are outer and inner oxide layer. The outer oxide layer consists of Li_xFe_1-xO. However, the inner oxide layer consists of Li_xFe_1-xO with（Li,Fe）₂SiO₄ dispersion in the case of Si addition, while the inner oxide layer consists of Cr dissolved Li_xFe_1-xO in the case of Cr addition.