A Ta-W alloy coating was deposited on pure Ta plate by coaxial laser cladding, using tungsten powder as cladding material. The microstructure of the coating was analyzed by scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS). The microhardness was examined by hardness tester. The high temperature hypersonic flow ablation property was tested in the wind tunnel system. It is found that the coating is metallurgically bonded with the substrate. The clad layer has a microstructure consisting of dendrite Ta-W solid solution uniformly dispersed in the Ta matrix. The average microhardness of the clad layer is approximately 8 GPa and it is 5 times greater than that of the Ta substrate. The ablative property is also obviously improved.