Practical use of extraction system water - orthophosphoric acid - for determination of by thoipyrine has been investigated in the work. Palladium forms with the reagent yellow-brown complex. Spectrum of absorption of the complex and the reagent in variable concentration of phosphoric acid and the complex in system H₃PO₄-CCl₃COOH has been made, working wavelengths of UV field (l = 350 nm) and visible field (l = 541 nm) have been determined. Optimal conditions of the determination were in investigated. The procedure of extraction photometric determination of palladium by thoipyrine in nickel - purrhotime concentration has been developed.