Using 5.9 pb$^{-1}$ of $e^+e^-$ annihilation data collected at center-of-mass
energies from 3.640 to 3.701 GeV with the BESIII detector at the BEPCII
Collider, we measure the observed cross sections of $e^+e^-
ightarrow
K_{S}^{0} X$ (where $X= ext{anything}$). From a fit to these observed cross
sections with the sum of continuum and $psi(3686)$ and $J/psi$ Breit-Wigner
functions and considering initial state radiation and the BEPCII beam energy
spread, we obtain for the first time the inclusive decay branching fraction
$mathcal B(psi(3686)
ightarrow K_{S}^{0} X) = (16.04 pm 0.29 pm 0.90)\%$,
where the first uncertainty is statistical and the second is systematic.
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