Abstract: This paper systematically investigates the direct photodissociation process of H₂ considering temperature effects (2.7 K – 15000 K). Under the assumption of local thermodynamic equilibrium (LTE), we calculate the rovibrationally resolved direct photodissociation cross sections from the ground state to the excited states B^1\Sigma _\textu^+ and C^1\Pi _u . From the corresponding LTE cross sections, the photodissociation rates of the molecule in a blackbody radiation field at different temperatures are further evaluated. In addition, this paper analyzes the spontaneous radiative dissociation process from excited states to the low-energy continuum. Our calculations show that spontaneous radiative dissociation is an important dissociation channel for H₂ and significantly affects the spontaneous emission lifetimes of the excited states. Taking the B^1\Sigma _\textu^+ state as an example, at ν' = 12, J' = 1 the spontaneous radiative dissociation rate is 5.127\times 10^8\;\texts^-1 . After including this process, the total radiative lifetime decreases from 2.120\times 10^-9 to 1.016\times 10^-9\;\texts . The results also indicate that spontaneous radiative dissociation dominates H₂ dissociation under both low- and high-temperature conditions. All calculations are based on the latest high-precision potential energy curves and transition dipole moments, and the obtained results can provide high-precision reference data for studies on H₂ dissociation dynamics and related models.