Superexcited States (SESs) of oxygen molecules and their neutral dissociation processes have been studied both experimentally and theoretically using intense femtosecond laser. We find that at the laser Intensity of similar to 2 x 10(14) W/cm(2), ultrashort laser pulse causes neutral dissociation of oxygen molecule by way of SESs. The dissociation products are the excited neutral oxygen atoms, which are observed that fluorescence,Spectroscopy. Laser power dependence of the fluorescence intensity shows that each molecule effectively absorbs ill average of tell laser photons. The total energy absorbed is sufficient to stimulate the molecule to many of the SESs The effect is equivalent to single photon excitation in the extreme-ultraviolet (XUV) region by synchrotron radiation (SR). Morse potential energy curves (PECs). are constructed for the SESs of O-2 molecules. In light of the PECs, predissociation mechanism is proposed for the neutral dissociation. Quasi-classical trajectroy (QCT) calculations show that the predissociation time is as short as 100 fs, which is consistent with our experimental measurement using ultrafast pump-probe technique