This Communication describes a new light-controlled release system based on molecular recognition of cyclodextrins. Azobenzene (Azo) residue is employed as a photoresponsive guest residue because it can switch the partner from alpha-cyclodextrin (alpha CD) to beta-cyclodextrin (beta CD) by irradiation with UV light. Poly(sodium acrylate)s possessing alpha CD, beta CD, and Azo residues (pA alpha CD, pA beta CD, and pAAzo, respectively) are mixed in aqueous solutions to form aggregates through the formation of inclusion complexes of Azo with alpha CD and/or beta CD. A chemical cargo, 1-pyrenemethylammonium chloride (PyMA), is contained in the aggregates, and its release behavior is investigated by dialysis experiments under UV irradiation. These data indicate that the amount of PyMA released for the pA alpha CD/pA beta CD/pAAzo ternary mixture is approximately three times as high as those for the pA alpha CD/pAAzo and pA beta CD/pAAzo binary mixtures because of the light-controlled rearrangement of inclusion complexes.