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An unified approach to the pseudo scalar meson ($\pi, \eta$, and $K$)photoproduction off nucleons are presented. It begins with the low energy QCDLagrangian, and the resonances in the s- and u- channels are treated in theframework of the quark model  The duality hypothesis is imposed to limit the number of the t-channelexchanges. The CGLN amplitudes for each reaction are evaluated, which includeboth proton and neutron targets. The important role by the S-wave resonances inthe second resonance region is discussed, it is particularly important for the$K, \eta$ and $\eta^\prime$ photoproductions.Comment: 31 pages in Latex fil

Unified approach to pseudoscalar meson photoproductions off nucleons in the quark model