The paper describes the conditions of polarographic reduction of trinitrotriphenylamine. The reduction occurs in 2 steps of similar height (one for trihydroxylaminotriphenyl-amine and the other for triaminotriphenylamine). The method allows the polarographic determination of trinitrotriphenylamine between 0.1–0.5 mg/ml. In the presence of silver ions, the polarographic steps are shifted to more negative potentials, which indicates formation of a compound of silver with triaminotriphenylamine.