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The steam-gasi fication reaction characteristics of coal and petroleum coke(PC) were studied in the drop tube furnace(DTF). The effects of various factors such as types of carbonaceous material, gasi fication temperature(1100–1400 °C) and mass ratio of steam to char(0.4:1, 0.6:1 and 1:1 separately) on gasi fication gas or solid products were investigated. The results showed that for all carbonaceous materials studied, H2 content exhibited the largest part of gasi fication gaseous products and CH4 had the smallest part. For the two petroleum cokes, CO2 content was higher than CO, which was similar to Zun-yi char. When the steam/char ratio was constant, the carbon conversion of both Shen-fu and PC chars increased with increasing temperature. When the gasi fication temperature was constant, the carbon conversions of all char samples increased with increasing steam/char ratio. For all the steam/char ratios, compared to water gas shift reaction, char-H2 O and char-CO2 reaction were further from the thermodynamic equilibrium due to a much lower char gasi fication rate than that of water gas shift reaction rate. Therefore, kinetic effects may play a more important role in a char gasi fication step than thermodynamic effects when the gasi fication reaction of char was held in DTF. The calculating method for the equilibrium shift in this study will be a worth reference for analysis of the gaseous components in industrial gasi fier. The reactivity of residual cokes decreased and the crystal layer(L002/d002) numbers of residual cokes increased with increasing gasi fication temperature. Therefore, L002/d002, the carbon crystallite structure parameter, can be used to evaluate the reactivity of residual cokes.