IR spectral characteristics of several minerals after boron adsorption or desorption showed that,com pared to the minerals themselves,spectra of boron desorbed from the minerals were similar to those of boron adsorbed,therefore,hysteresis of boron desorption was significant for most of the experimental min erals'spectra of Ca montmorillite and bayerite at 1 400~1 440 cm^-1 and 1 600~1 670 cm^-1 were alike,which showed that aluminum located at broken edge of Ca montmorillite would reacted with boron'spectra of manganite were similar to bayerite at 1 000 cm^-1 and 1 400~1 440 cm^-1,and this showed that charac ters of boron adsorption for these two hydroxides were alike.The infrared spectra showed at 1 400~1 440 cm^-1 after goethite absorbing boron peaks were enhanced,especially,at 1 000~1 200 cm^-1,the absorption peak of tetrahedral boron when boron desorption from goethite significantly occurred.From these we can reason out that boron adsorbed on the mineral may polymerize itself and this process would produce boron polymer in the mineral surface,for example,like borax.