Due to the adverse effect of climate change and depletion of fossil fuel, using renewable energy is considered inevitable. Several studies related to renewable energy are executing all over the world. For study purpose, we conducted gasification experiment in a pilot scale plant (8 ton/day) using solid refuse fuel (SRF) as feedstock. The SRF was produced from Municipal Solid Waste (MSW) by mechanical biological treatment (MBT) process, which includes processes like crushing, sorting and drying. This process had various cleaning system for gaseous pollutants and tar. Cleaning system was composed with cyclone, scrubber, wet electric precipitator and moisture removal system. And, for assessment of stable operation of gasification process, we conducted gasification experiment of several kinds including changing of equivalent ratio (ER), charging rate (CR) and oxidant separation. Through these experiment, we could calculate efficiency index of gasification which were cold gas efficiency (CGE), gas yield (Gy), lower heating value (LHV) of syngas and carbon conversion ratio (CCR). Lastly, we analyzed various pollutants which were tar in syngas, dust and gaseous pollutants for environmental assessment.