  We report on a very bright, long-duration gamma-ray burst (GRB), GRB~220426A,
observed by \emph{Fermi} satellite. GRB~220426A with total duration of
$T_{90}=6$~s is composed with two main pulses and some sub-peaks. The spectral
analysis of this burst with Band function reveals that both the time-integrated
and the time-resolved spectra are very narrow with high $\alpha \gtrsim 0.2$
and low $\beta\lesssim -3.1$. It is strong reminiscent of GRB~090902B, a
special GRB with identification of the photospheric emission. Then, we perform
the spectral analysis of this burst based on a non-dissipated photospheric
emission, which can be well modelled as the multicolor-blackbody with a cutoff
power-law distribution of the thermal temperature. The spectral fittings reveal
that the photospheric emission can well describe the radiation spectrum of this
burst. We conclude that this burst would be a second burst in the class of
GRB~090902B observed by \emph{Fermi} satellite. We also discuss the physics of
photosphere and the origin of the high-energy component in GRB~220426A .

High Energy Astrophysical Phenomena