The influences of Nb and Cr on the microstructure and properties of the Fe-matrix laser clad composite coating reinforced by in situ particles are studied of Ti, W, Nb and Cr with different contents and ratios adding into the FeCSiB cladding powder, and in situ particle reinforced Fe-matrix composite coating is produced by laser cladding. It reveals that clad layers with good forming and homogeneous microhardness distribution are produced by adding Nb and Cr other separately or simultaneously. The particle distribution can be influenced by the contents of Nb and Cr efficiently. The microhardness of the layers increases firstly and then decreases with the content of Nb increasing, and decreases with the content of Cr increasing. The impact wear resistance is related to the toughness of the material. The micron carbide particles will not improve the impact wear resistance of the particle reinforced composite coating.