We report a theoretical analysis of the electronic, optical, and mechanical properties of zinc-blende GaP semiconductor material. High-temperature impact on the interesting features has been reported. The temperature dependence of sound velocity and phonon frequencies of GaP has been determined. The pseudopotential technique has been used in our study. The current study can help in our comprehension of how temperature affects the electronic characteristics of GaP material. Our findings show generally a good accordance with the experiment. The prediction properties could be used in optoelectronic applications in the high-temperature range.