Abstract: After the sample was digested with HNO3-H2SO4,arsenic was converted into gaseous arsenic hydride.The silver nitrate-polyvingyl alcohol-ethanol system was absorbent liquid.Micro arsenic was determined by photometry.The recovery of the method found was 85.3%～93.7% with an average RSD 3.7%.The method offered the advantages of simplicity and sensitivity while the reagents were nontoxic.It has been applied to the analysis of commodity cosmetics with satisfactory results.