Acridine orange(AO)molecules were incorporated in AlPO4-5,SAPO-5 and SAPO-47 single crystals by vapor-phase diffusion method.Polarized absorption spectra show that AO molecules are well aligned by the one-dimensional channel systems of AlPO4-5 and SAPO-5 matrices.While the orientation of AO molecules in SAPO-47 crystals is diverse owing to the three-dimensional cage structure of chabazite(structure code CHA).