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The $N^*(1535)S_{11}$ coupling strength to the $K^+\Lambda$ channel,$g_{N^*(1535)\Lambda K^+}$, is extracted from the latest and largest$K^+\Lambda$ photoproduction database by using an isobar model. It is foundthat the coupling is small. In term of the coupling ratio the best result is$R\equiv |g_{N^*(1535)\Lambda K^+}/g_{N^*(1535)\eta p}|=0.460\pm 0.172$, muchsmaller than that obtained from the isobar analysis of the $J/\psi$ decays,i.e., $1.3\pm 0.3$, but consistent with the results of the unitary chiralapproach of the same decay processes as well as the partial wave analysis ofkaon photoproduction, i.e., $R=0.5\sim 0.7$. The different results of $R$ foundhere and in literature to date suggest that a more solid definition of thecoupling constant, especially in the case of $N^*(1535)S_{11}$ state, isurgently required, before a fair comparison can be made.

Coupling strength of the $N^*(1535)S_{11}$ to the $K^+\Lambda$ channel