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The properties of surface plasmon polaritons (SPPs) excited in the plasma-dielectric-magnetic plasma structure are investigated theoretically.Both the normal and the absorbing dispersion relations of SPPs are derived and presented for transverse-magnetic polarization.The influences of the external magnetic field,collision frequency of plasma,background material dielectric constant,and thickness on the characteristics of SPPs are explored and discussed.Results show that these factors greatly alter the properties of SPPs.The results imply that the locations and propagation length of SPPs can be tuned.In addition,the results also show that a one-way dispersion relation of SPPs can be realized in the low-frequency regions when the external magnetic field is introduced.