With the preset powder, Fe-based amorphous composite coating was prepared by laser cladding on 700 MPa steel. The effects of laser scanning speed and laser power were studied on micro-hardness of laser cladding layer, which shows that a proper scanning speed and 1.5 kW of laser power will be better for getting higher micro-hardness of laser cladding layer. At the same time, the influence of micro-alloy element Nb and Nitrogen content were studied on the micro-hardness of laser cladding layer.