Infrared photodissociation spectroscopy is an extensive used experimental technique to probe the vibrations of ionic clusters via messenger tagging. The interactions between messengers and ion clusters are found not simply perturbative and can modifying the resulting spectra significantly. In present work, we investigate the Argon micro- solvation of hydronium ion H3O+Arm, m=0-3. The theoretical study reveals the importance of vibrational coupling and the solvation interaction in order to account the spectral features exactly .