The microstructures and kinetics of reaction between aluminum and amorphous silica are investigated by making use of advantages of silica glass's larger dimension.Al/Al2O3 composite microstructures can be synthesized by longer time reaction and the diffusion transit layer is discovered between aluminum melts and the Al/Al2O3 composite layer.The growth kinetics of diffusion transit layer and Al/ Al2O3 composite layer are also measured and discussed.The effect of silicon element on the diffusion transit layer and the composite layer' kinetics is discussed and parabola growth kinetics of Al/Al2O3 composite layer is determined.