In order to analyse the gasification characteristics of high ash slag fusibility coal with coal water slurry for use as gasification feedstock,the gasification reaction characteristics of Lao Kuang's coal were studied in a drop tube reactor.The effects of gasification temperature and O/C Molar ratio on the properties of gas products,carbon conversion and cold gas efficiency were investigated.The results indicate that the concentration of effective syngas,the rate of carbon conversion and the efficiency of cooled coal gas all increase with the increase of temperature at the same O/C Molar ratio condition.As the O/C Molar ratio increases,the rate of carbon conversion and the concentration of CO₂ increase and the efficiency of cooled coal gas shows a decreasing trend after the first increase at the same temperature condition.Under the experimental conditions,the best O/C Molar ratio of Lao Kuang's coal is 0.90~1.05.