Abstract: An UV spectrometric method for the determination of the light stabilizer and the antioxidant from polymeric blends was developed. The investigated antioxidant and light stabilizer were: 2,2`-Methylene bis (6-tertbutyl-4-methylphenole), noted MBP and Tinuvin P (2-(2`-Hydroxy-5`-methylphenyl)-benzothriazole), noted TP. The described procedure works without any separation step of MBP and TP from each other and from the other polymer additives (namely stearic acid and paraffin). The second derivative signal measured at 281 nm was used for the elimination of the interferences of the other additives in the MBP estimation, while for determination of TP, the first derivative was measured at 326 nm. Beer`s law has been valid in the concentration range of 1.5-30 ppm MBP and 1.0-30 ppm TP. The proposed method has been applied to the determination of MBP and TP in synthetic binary and tertiary mixtures and in polymeric blends with certified formula.