Abstract: Two high-strength steel powders of 1Cr12Ni2 and AM355 powders were used for laser cladding on the surface of 30CrMnSiNi2A steel respectively, and the specimens cladded with 1Cr12Ni2 and AM355 powders were prepared. The mechanical properties of the two specimens were tested. Further, the microstructure and fracture morphology were investigated by the means of optical microstructure(OM), scanning electron microscopy(SEM)and X-ray diffractometer.The results show that the microstructure of the cladding layer of the two specimens are both martensite, while cellular microstructure exhibits in the specimen cladded with AM355 powders. The specimen cladded with 1Cr12Ni2 powders exhibits inferior mechanical properties with ultimate tensile strength of 1300 MPa, elongation of 3%and impact toughness of 27 J/cm². The AM355 cladding layer has more alloying elements, the solid solution strengthening is more obvious, and the content of the austenitic stabilized element nickel is higher, and the austenite volume is higher, the plasticity and toughness is better.Therefore, the specimen cladded with AM355 powders possesses a superior comprehensive mechanical properties with ultimate tensile strength of 1380 MPa, elongation of 5% and impact toughness of 55 J/cm². The fractography of cladding surface in tensile specimen cladded with AM355 steel powders is primarily elongated dimples, and the fractography of cladding surface in impact specimen exhibits numerous locally fluctuated tiny dimples. The characteristics of fractogrphy shows better ductility and impact toughness.