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Prism coupling in the Kretschmann configuration is a well-known method for the excitation of surface plasmon polaritons(SPPs)in thin films bounded from one side by a prism and from the other side by air.Based on the Kretschmann configuration,we experimentally study the transport properties of a silver thin film with a thickness of 55nm and a width of 500μm undergoing total inteal reflection.We observe considerable negative photoconductivity in the film induced by the SPPs excited in this configuration and find that both SPP-electron interactions and SPP-induced heating have contributions to the negative photoconductivity.We believe that the new phenomena,which result from the combination of photonics and electronics,will be useful in relative technical applications and scientific research.