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A new method for the determination of utratrace silver(I) by near field thermal lens spectrometry has been developed. This method is based on the silver(I) catalyzed discoloring reaction of bromocresol green oxidized by sodium persulphate in the presence of α, α′-bipy as activator and Triton X-100 as sensitizer. The linear range of this method is 0～1.6 ng@mL-1 of silver. The detection limit is 2×10-2 ng@mL-1. The method has been applied to the determination of silver in lead power and photographic paper with satisfactory results.