In this paper,four hemicelluloses were extracted through alkali or dimethyl sulfoxide form the apple dietary fiber,hemicellulose A,B,C and E.The chemical composition and surface micro-structure of the four hemicelluloses were studied by FTIR and SEM.It was found that the hemicelluloses in apple dietary fiber were composed of xyloglucan(hemicellulose A),xylanase 1(hemicellulose B)and xylanase 2(hemicellulose C)and galactomannan(hemicellulose E).Surface micro-structure on four hemicellulose grain were very different,xylanase 1 has regular appearance of the crystal shape,crystalline nature.Xyloglucan has granular appearance,a certain degree of crystalline nature.xylanase 2 is non-crystalline with irregular surface.