Abstract: A new model of gas producer working under the principle of pyroiysis with a raw gas thermal cracking section was built and tested for the purpose of optimization of design and operational parameters with open air dried corncobs as fuel.The experimental results showed that the raw gas thermal cracking technology could improve substantially the gasification process of corncobs. The tar content in the gas producer was less than 9% ,and gas production rate was more than 74%, with a much higher heating value than that of conventional gas producer in rural uses.