In order to obtain the solubility of carbon in vanadium-bearing hot metal, grahite powder is used for the carburization experiments. The other kinds of carburizers, namely low nitrogen carburizer, anthracite and coke are used for carburization of vanadium-bearing hot metal weighing 500g at temperature of 1450C,1500C and 1550C respectively. Carbon increments of low nitrogen carburizer, anthracite and coke fall in descending order. It was found by comprehensive analysis that anthracite is the most cost-effective carburizer among three carburizers. Magnitude of apparent rate constant of carburization reactions is 10-4s-1. It is found that the carburization rate increase with temperature.