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Positron excess observed by PAMELA, Fermi and AMS02 may be due to dark matter(DM) pair annihilation or decay dominantly into muons. In this paper, weconsider a scenario with thermal fermionic DM ($\chi$) with mass $\sim O(1-2)$TeV decaying into a dark Higgs ($\phi$) and an active neutrino ($\nu_a$)instead of the SM Higgs boson and $\nu_a$. We first present a renormalizablemodel for this scenario with local dark $U(1)_X$ gauge symmetry, in which theDM $\chi$ can be thermalized by Higgs portal and the gauge kinetic mixing.Assuming the dark Higgs ($\phi$) mass is in the range $2 m_\mu < m_\phi < 2m_{\pi^0}$, the positron excess can be fit in a natural manner without conflictwith constraints from antiproton and gamma ray fluxes or direct detectionexperiments. Also having such a light dark Higgs, the self-interaction of DMcan be enhanced to some extent, and three puzzles in the CDM paradigm can besomewhat relaxed.

AMS02 positron excess from decaying fermion DM with local dark gauge symmetry