In recent years, the problem of plastic waste has greatly increased because of industrial growth. As a result, the amount of plastic waste in domestic area is approximately 4,250,000 ton in 2007. The ways of these plastic waste disposal are still mainly relying on landfill or partially incineration. So it has become a serious social problem due to the secondary environmental pollution. Pyrolysis is one of the major process in treating waste plastic but still has some restrictions for the commercialization due to its economical problems associated with a systematic feed collection/disposal ways. Considering environmental problems, for example the increase in the charge for waste materials treatment and the limitation of disposal area, it is interesting that the plastic waste treatment by pyrolysis and gasification, which seems to be the safest process for converting feed waste to reusable resources, would be predominant in the near future. This study is aimed to increase the amount of syn-gas products from melamine resin by using steam as plasma gas in plasma system. At the first trial of melamine-steam gasification the syn-gas(CO+H2) was produced to 60.2vol% at the resin/steam ratio of 2.0