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The second-order harmonic field characteristics at the solid-solid interface with P wave incidence were evaluated according to the second-order potential theory. An isotropic solid-solid interface was established to solve the boundary value problem of second-order non-homogeneous potential equation based on the Lagrange's method of variation parameters. A numerical computation was performed to analyze the incident angle and second-order harmonic displacement. The results show that the longitudinal wave and transverse wave displacements of second-order harmonic field rapidly increase at a specific incidence angle. Moreover,the special solutions of displacement abruptly change for incident angle 6w. Finally,the effect of boundary surface on second-order harmonic sound field is also discussed.