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Nanosecond pulse generation in an erbium-doped fiber laser (EDFL) passively mode-locked by a silver nanoparticle (SNP)-based saturable absorber (SA) is experimentally demonstrated.The SA is fabricated by depositing a nanosized SNP layer onto the surface of polyvinyl alcohol film through the thermal evaporation process.By inserting the SA into an EDFL cavity,stable mode-locked operation is achieved at 1561.5 nm with the maximum pulse energy up to 52.3nJ.The laser operates at a pulse repetition frequency of 1.0 MHz with a pulse width of 202ns.These results suggest that SNPs could be developed as an effective SA for mode-locking pulse generation.