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GRB 160625B is an extremely bright GRB with three distinct emission episodes.By analyzing its data observed with the GBM and LAT on board the {\em Fermi}mission, we find that a multi-color black body (mBB) model can be used to fitthe spectra of initial short episode (Episode I) very well within thehypothesis of photosphere emission of a fireball model. The time-resolvedspectra of its main episode (Episode II), which was detected with both GBM andLAT after a long quiet stage ($\sim 180$ seconds) of the initial episode, canbe fitted with a model composing of an mBB component plus a cutoff power-law(CPL) component. This GRB was detected again in the GBM and LAT bands with along extended emission (Episode III) after a quiet period of $\sim 300$seconds. The spectrum of Episode III is adequately fitted with a CPL plus asingle power-law models, and no mBB component is required. These features mayimply that the emission of three episodes are dominated by distinct physicsprocess, i.e., Episode I is possible from cocoon emission surrounding therelativistic jet, Episode II may be from photosphere emission and internalshock of relativistic jet, and Episode III is contributed by internal andexternal shocks of relativistic jet. On the other hand, both X-ray and opticalafterglows are consistent with standard external shocks model.

Extremely bright GRB 160625B with multi-episodes emission: Evidences for long-term ejecta evolution