Ta-W alloy coatings were deposited on pure Ta plate by laser cladding with pre-coating and coaxial powder injection respectively in order to find the effects with two technique. The microstructure of the coatings was analyzed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The microhardness was examined by hardness tester. The clad layer which formed with pre-coating had a microstructure of coarse columnar grain and low dilution rate with the substrate. The average microhardness of the clad layer was 1500 HV, it was 10 times greater than the Ta substrate. The clad layer deposited with coaxial power injection had a microstructure consisting of dendrite Ta-W solid solution uniformly dispersed in the Ta matrix. The average microhardness of the clad layer was approximately 800 HV and it was 5 times greater than that of the substrate.