  In this work, we study the implications of GW230529 on gravity theories and
the charge of black holes. The GW230529, which was initially released in O4a,
is most likely neutron star-black hole (NSBH) mergers. We reanalyze the data
from the GW230529 event to obtain bounds on the Einstein-dilation-Gauss-Bonnet
(EdGB) gravity parameter $\sqrt{\alpha_{\rm EdGB}}$ and the electric charge of
compact binary systems. The event places a $90\%$ credible upper bounds on
$\sqrt{\alpha_{\rm EdGB}}$ of $\lesssim 0.298$ km. After including high order
corrections of EdGB gravity, the bounds improve to $\sqrt{\alpha_{\rm EdGB}}
\lesssim 0.260$ km. Analyses of GW230529 also yield a $90\%$ credible upper
bounds on the combination of charge-to-mass ratio of the binary components
$\zeta \lesssim 0.024$. The constraints are more stringent than those derived
from previously observed single gravitational wave merger event.
