In this study, variable chemical kinetic mechanism between aluminum and water vapor were selected. Major species,which were produced by reaction with aluminum and water vapor,were compared with another reference as a result total 41 chemical kinetic mechanism and 19 species were validated. Aluminum droplet size is 230 μm and analyzed as 2-D axisymmetric model. As using Fluent 13.0, governing equations and species equation were solved onsurrounding aluminum droplet. The condensation/dissociation of alumina, that is the species of major aluminum oxide, were considered by including chemical kinetic mechanism