  The newly measurement of production fractions of $P_c$ states by LHCb
collaboration have put restriction on their branching ratios of $J/\psi p$
decay, thus constraining their photoproduction in $\gamma p\to J/\psi p$
reaction. We show the tension between LHCb results and the current experiments
in search of $P_c$ photoproduction. We also find that the present information
of branching ratios of $P_c\to J/\psi p$ has already confronted sharply with
the models which study the nature of $P_c$.
