The catalytic organic residue contained Rh was digested with HNO3 at 130degreesC for 12 h. Trace noble metal Rh in catalytic organic residue was determined by flame atomic absorption spectrophotometry. Rh was atomized by air-acetylene flame at lamp Current of 7 mA. The methods of sample pretreatment for Rh in residue were compared in this paper. The recovery rates of this method were 95.3%-105.5% and the relative standard derivation was 0.9% The method was applied to the analysis of some practical samples and the results obtained were satisfactory.

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