  The process $e^{+}e^{-}\to\Sigma^{+}\bar{\Sigma}^{-}$ is studied from
threshold up to 3.04 GeV/$c^2$ via the initial-state radiation technique using
data with an integrated luminosity of 12.0 fb$^{-1}$, collected at
center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector at
the BEPCII collider. The pair production cross sections and the effective form
factors of $\Sigma$ are measured in eleven $\Sigma^{+}\bar{\Sigma}^{-}$
invariant mass intervals from threshold to 3.04 GeV/$c^2$. The results are
consistent with the previous results from Belle and BESIII. Furthermore, the
branching fractions of the decays $J/\psi\to\Sigma^{+}\bar{\Sigma}^{-}$ and
$\psi(3686)\to\Sigma^{+}\bar{\Sigma}^{-}$ are determined and the obtained
results are consistent with the previous results of BESIII.
