In this study, the psychotherapy process of a 14-year-old adolescent girl (Derin) diagnosed with depression with projective tests -Rorschach and Thematic Perception Test- and the contributions of projective tests to the psychotherapy process and the environment tests prepared for the study of unconscious material will be discussed. Derin was diagnosed with depression by her psychiatrist and started on medication, in addition to this, it was decided that she needed psychotherapy. The psychotherapist thought that projective tests would be useful in understanding the patient's psyche and in the psychotherapy process and directed the patient for the tests. When Derin came to the test, she stated that she had difficulties in school attendance and social relations in addition to the diagnosis of depression. When her history was taken, it was learned that Derin's father left home as a result of divorce at an early age and that Derin, who lives with his mother and sibling rarely saw her father. When the tests were analyzed, it was observed that the patient sublimated the maternal object, at the same time this sublimated object was experienced as very fragile and the bond established with the maternal object continued with a depressive affect that could be called melancholic. In the responses in which the relationship with the mother is given, responses such as angel, heaven are seen, and these are accompanied by C' coding. The patient's verbal defenses in the tests were also perseverative and remarkable. Especially in the thematic perception test, verbal defenses such as "past tense, meaningless, I don't understand history" are used to suppress the anxiety caused by the test, but also point to narcissistic deficiency. The emergence of the urge is also a difficult issue. Especially in the cards where the sexual drive may emerge, the drive is frozen and defined as a "photo frame". Sexual urges frozen during adolescence may be thought to be a defense against a rivalry with the mother. The inadequacy of the patient's capacity to be alone, the sublimated but fragile nature of the maternal object, and the narcissistic deficiencies of the subject who does not want to compete with her and harm her creates a depressive picture. At the beginning of the psychotherapy process, Derin's efforts to construct herself through a self dominated by the mother's ideals, the fact that men relate to her only for their sexual desires and therefore the opposite sex is devalued are addressed, while in the following process, issues such as her own destructiveness damaging the mother's psyche, neglect of emotions, intense feeling of loneliness are studied and the themes are consistent with the unconscious material projective tests.