A coupled chemiluminescence method for the determination of some carhoxylic acids was devel-oped, based on their enhancement the chemiluminescence light emission of the reaction of tirs(2, 2’-bipyri-dine) ruthenium(Ⅱ) and Ce(Ⅳ) in sulfuric acid medium. The conditions for their determination were opti-mized. The following detection limits were obtained: oxalic acid, 2. 67×10-8 mol/L; propandioic acld, 1.20×10-6 mol/L; pyruvic acid, 1. 35 ×10-8 mol/L; citric acid, 5.10×10-8. mol/L; barbituric acid, 2.48×10-7,mol/L. The proposed method was successfully applied to determination or oxalic acid. The coupled chemilu-minescent reaction mechanism and rate equation are proposed. A coupled chemiluminescence method for the determination of some carhoxylic acids was devel- oped, based on their enhancement of the chemiluminescence light emission of the reaction of tirs (2, 2’-bipyri-dine) ruthenium (II) and Ce The following detection limits were obtained: oxalic acid, 2. 67 × 10 -8 mol / L; propandioic acld, 1.20 × 10 -6 mol / L; pyruvic acid, 1 The proposed method was successfully applied to determination or oxalic acid. The coupled method was successfully applied to the determination of or oxalic acid. 35 × 10-8 mol / L citric acid, 5.10 × 10-8 mol / L barbituric acid, 2.48 × 10-7 mol / chemilu-minescent reaction mechanism and rate equation are proposed.