The time-of-flight method was used to study the laser-stimulated desorption of atoms and molecules from the surface of ZnO. The kinetic energy distributions of desorbed oxygen molecules are characterized by the presence of two forms: "fast" with kinetic temperature ≈ 3000 K and "slow" with T_k ≈ 550 K. The first one is typical for desorption excitation in the self-absorption region (hv > E_g), and the second one in the transparent region. Two non-thermal mechanisms of desorption are suggested.