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The behavior and characteristics of surface plasmon polaritons (SPPs) in metallic systems are not only determined by the materials and the structure [1～3], but also strongly depend on the excitations.The behavior and characteristics of SPPs excited by perpendicular moving electron beam (see fig.1 a) and parallel moving electron beam (see fig.l b) and their outcomes [4～6] have been studied in detail, and the results show that they are essentially different for different excitation.Comparing the excitation of perpendicular electron beam and parallel electron beam, the results show that for the second excitation, the coherent,tunable and room temperature light radiation can be obtained.