The aim of this research is the elaboration of diagnostic instruments for revelation of the level of artistic experience development of young teenagers on the base of polyart approach and also analysis of diagnostic arrangements with fifth-year pupils. The criteria, parameters and level of artistic experience development of teenagers were described in the article; the author's diagnostic tasks were elaborated according to the polyart approach. The diagnostic methods (testing, essay, questionnaire, creative tasks) were determined for each parameter. The diagnostic arrangements at institutions of general education allowed make a conclusion about the necessity to raise the level of artistic experience development of pupils and to prognosticate thhe methods that favor it. Кeywords: artistic experience, polyart approach, diagnostic methods (testing, essay, creative tasks), young teenagers.