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We study the contributions for $K\eta^{\prime}$ pair originating from thescalar intermediate state $K_0^{*}(1430)$ in the three-body decays $B\toK\eta^{\prime} h$ ($h=\pi, K$) within the perturbative QCD approach. Thecontribution of $K^*_0(1430)\to K\eta^{\prime}$ is described by the Flatt${\rm\acute{e}}$ formula with coupled channels $K\pi$, $K\eta$ and $K\eta^{\prime}$.The strong coupling constants $g_{K^*_0K\eta^{(\prime)}}$ are extracted from$g_{K^*_0 K\pi}$ within flavor SU$(3)$ symmetry. In spite of the strongdepression by phase space near the threshold of $K\eta^\prime$, the $CP$averaged branching fractions for the $B\to K^*_0(1430) h \to K\eta^\prime h$decays are predicted to be on the order of $10^{-8}$ to $10^{-5}$, which arenon-negligible for the corresponding three-body $B$ decays. Since the K$\eta$system is almost decoupled from the even-spin strange mesons under flavorSU$(3)$ symmetry, those quasi-two-body $B$ decays with subprocess $K^*_0(1430)\to K \eta$ shall have quite small branching ratios and are not taken intoaccount in this work. We also estimate that the branching fraction for$K_0^{*}(1430)\to K\eta^{\prime}$ is about one fifth of that for$K_0^{*}(1430)\to K\pi$. The predictions for the relevant decays are expectedto be tested by the LHCb and Belle-II experiments in the future.

Contributions of the subprocess $K^*_0(1430) \to K\eta^{\prime}$ in the charmless three-body $B$ meson decays