The effect of doorway states on the p-wave neutron strength functions is investigated for even-even target nuclei in the vibrational region. A semi-empirical formula including contributions from both doorway state and coupled channel is derived for the p-wave strength function. The calculated results are compared with experimental data. Overall agreement in the mass region of 40180 is fairly well except for a few nuclides. In addition, isotopic trends of the p-wave neutron strength functions are studied for Cr, Fe, Ni, Zn, Se, Zr, Mo, Ru, Pd, Cd and Nd.
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