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The recently reported result from XENON1T experiment indicates that there isan excess with $3.5\sigma$ significance in the electronic recoil events.Interpreted as new physics, new sources are needed to account for theelectronic scattering. We show that a dark fermion $\psi$ with mass about $\mathcal{O}\left(10\right)$ MeV from semi-annihilation of $Z_3$ dark matter $X$and subsequent decay of a dark gauge boson $V_\mu$ may be responsible for theexcess. The relevant semi-annihilation process is $X+X\rightarrow\overline{X}+V_\mu (\rightarrow \psi + \overline{\psi})$, in which the final$\psi$ has a box-shape energy spectrum. The fast-moving $\psi$ can scatter withelectron through an additional gauge boson that mixes with photon kinetically.The shape of the signals in this model can be consistent with the observedexcess. The additional interaction with proton makes this model testable infuture searches for nucleus recoil as well. Because of the lightness ofinvisible particle introduced, this scenario requires non-standard cosmology toaccommodate the additional radiation component.

Semi-annihilating $Z_3$ Dark Matter for XENON1T Excess