GRB 160625B was detected by both the Fermi Gamma-Ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on board the Fermi Gamma-Ray Space Telescope, launched in June 2008. This event is associated with more than 300 high-energy photons above 100 MeV with probabilities larger than 90%. The highest energy photon is detected at 346.2 seconds after the Gamma-ray Burst Monitor (GBM) trigger with an energy of 15.3 GeV. The time-resolved spectral analysis of bursts has been presented using both the GBM and LAT data. At early times 2.05 seconds from the LAT trigger, the spectral analysis reveals an extra black body component which provides high-temperature kT = 92.03 $\pm$ 3.31 keV. The highest peak energy measured during this emission episode is 2201.0 $\pm$ 62.7 keV with the compatible fluence 8:38 $\pm$ 0.05$\times$10$^{-5}$ erg cm$^{-2}$ in the 10 keV - 1 MeV energy range. The result of temporal analysis for the LAT light curve coincident with the GBM and an optical afterglow of the Pi of the Sky has also been presented.