Abstract: A new complex chemiluminescence, i. e., luminol K₂S₂O₈ catalyzed by AuR₂⁺ complex is reported. Based on this catalyse a new chemiluminescence method for determining trace of Au(Ⅲ) is proposed. The detection limit is 1×10^-8 g/L Au(Ⅲ). The linear dynamic range is 1×10^-6～1×10^-4 g/L Au(Ⅲ) and the variation coefficient at a concentration of 1×10^-4 g/L Au(Ⅲ) is 2.0%(n=5). This method has been applied satisfactorily in the determination of trace gold in silicate.