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This article discusses the pressure-induced structural phase transition andrelated phonon, electronic and optical properties of hexagonal {\epsilon}-GaSeusing first-principles calculations. The study focuses on optimizing geometricand electronic band structures, analyzing the charge density distributions,atomic vibrations, and phonon spectra, and characterizing the opticalproperties of GaSe under hydrostatic pressure. The work also includes ananalysis of the phase transformation mechanism using the solid-state NudgedElastic Band (SS-NEB) method. This research sheds light on the physics ofstructural phase transitions in layered materials and offers potential for thedevelopment of pressure-manipulated electronics or optoelectronics.

From hexagonal to rocksalt structure: A computational study of Gallium Selenide under hydrostatic pressure