  We study the multiplicity fluctuation and correlation of identified mesons
and baryons formed at the hadronization by the quark combination mechanism in
the context of ultra-relativistic heavy-ion collisions. Based on the
statistical method of free quark combination, we derive the two-hadron
multiplicity correlations such as meson-meson and meson-baryon correlations,
and take the effects of quark number fluctuation at hadronization into account
by a Taylor expansion method. After including the decay contributions, we
calculate the dynamical fluctuation observable $\nu_{dyn}$ for $\text{K}\pi$,
$p\pi$ and $\text{K}p$ pairs and discuss what underlying physics can be
obtained by comparing with the data in Pb-Pb collisions at $\sqrt{s_{NN}}=2.76$
TeV and the simulations from HIJING and AMPT event generators.
