A new technology for preparation of TaC coating on C/C composite material is reported. The ethylate tantalum film is characterized by FT-IR spectra, XRD and SEM, and the TaC coating is characterized by XRD and SEM. The amorphous ethylate tantalum jellied is prepared and is spreaded out densely on the surface of C/C composite material to form a multi-films. In the graphite furnace the multi-films is transformed into the TaC coatings at various temperatures. At 1 200C the coating contains TaC and Ta2O5,and at above 1 400C only TaC exists. The structure of the coating at 1 600C is a continuous dense stratum structure, and at 1 400C is a porous net structure.