Abstract: Disclosed is a process for reforming hydrocarbon which comprises heating up to 800.degree. C. or higher a gaseous mixture of sulfur containing hydrocarbon with an oxidizing agent for reforming such as steam or a mixture of steam and carbon dioxide, while passing the gaseous mixture through an alkaline solid packing bed containing alkali metal and/or alkaline earth metal followed by bringing into contact thereof with a nickel containing catalyst at a temperature of 800.degree. C. or higher to produce a mixed gas containing hydrogen and carbon monoxide. An apparatus for the practice of the process is also disclosed.