In this work, photodissociation of O-2 at 157 nm has been studied using the photofragmentation translational spectroscopic technique. Two product channels O-2 + hv --> O(D-1) + O(P-3), O-2 + hv --> 0(P-3) + O(P-3) have been observed. The relative yields and anisotropy parameters of both channels are determined. Anisotropy mixing of dissociation resulting from a perpendicular excitation and a parallel-type excitation has been observed in the dissociation channel O-2 + hv --> O((3)p) + O(P-3). The observed results can be used to look at the detailed dynamical processes of the O-2 dissociation through the Schumann-Runge band.