  The newly confirmed pentaquark state $P_c(4312)$ has been treated as a weakly
bound $(\Sigma_c\bar{D})$ state by a well-established chiral constituent quark
model and by a dynamical calculation on quark degrees of freedom where the
quark exchange effect is accounted for. The obtained mass $4308$ MeV agrees
with data. In this work, the selected strong decays of the $P_c(4312)$ state
are studied with the obtained wave function. It is shown that the width of the
$\Lambda_c\bar{D}^*$ decay is overwhelmed and the branching ratios of the
$p\,\eta_c$ and $p\,J/\psi$ decays are both less than 1 percentage.
