Photodissociation of p-C6H4Cl2 cation stored in a rf ion trap cell was investigated by observing fragment yield spectra in the 312-327 nm region. The C6H3+ generation was found to be induced by the two-photon excitation enhanced with the resonance on the E-X transition of the parent cation. On the other hand, C6H4Cl+ generation was induced by the one-photon excitation of the parent ion. The state-selective fragmentation is discussed.