Abstract: The chemical reaction occured between the surfaces of silica,as a model of glass and silanes-H₂O system (or silanes-CCl₄ system),has begin directly detected by chromatography and Fourier Transform Infrared Spectra.This strongly proves the existence of chemical reaction on the interface between these two phases,that is to say,the interfacial structure bonded by chemical bonds.From experimental results results it can be infeaed that the -Si-O-Si bond,IR absorbing peak 1056-1063 cm^-1,appears by the by the homo-polycondensation reaction of silane itself.Then,the -Si-O-Si bond,IR absorbing peak 1105-1120 cm^-1,appears by the coolycon densation reaction detween silane and the fumed SiO₂.