  We propose to measure the decay asymmetry parameters in the hadronic weak
decays of singly charmed baryons, such as $\ldc\to\ld\pi^+,\Sigma^0\pi^+,p \bar
K_0$, $\Xi_c^0\to\Xi^-\pi^+$ and $\Omega_c^0\to\Omega^-\pi^+$. The joint
angular formulae for these processes are presented, and are used to extract the
asymmetry parameters in $\ee$ annihilation data. Base on the current $\ldc$
data set collected at BESIII, we estimate the experimental sensitivities to
measure the parameters $\alpha_{\ld\pi^+}$ for $\ldc\to\ld\pi^+$,
$\alpha_{\Sigma^+\pi^0}$ for $\ldc\to\Sigma^+\pi^0$ and $\alpha_{\usig\pi^+}$
for $\ldc\to\usig\pi^+$.
