This study is for the understanding of separation anxiety through Mahler’s Separation-Individuation Theory and for more integrated and clinical reflections upon separation anxiety through the application of Solution Focused Brief Therapy as a clinical approach. For this goal, I set my focus on how Mahler’s Separation-Individuation Theory explains and understands the separation anxiety symptom and if there is any positive change when Solution Focused Brief Therapy is applied to separation anxiety. Participant was a thirteen-year old female elementary student who was experiencing separation anxiety from her mother, who was a primary attachment figure. I had seven sections with her for counseling. As a result, I found out that Mahler’s Separation-Individuation Theory resulted from a response of a mother about her child’s conflict between independence and symbiotic and mutual interaction. In other words, Mahler’s Separation-Individuation Theory can be an important theoretical frame to explain separation anxiety. The Solution Focused Brief Therapy as a therapeutic approach to the study increased independence and self-confidence to control emotion and situation of oneself and help one to attain stable concepts of self and others. The Solution Focused Brief Therapy in which a counselor and a client work together for a problem resolution and find ways to cope with through client’s strength and resource functioned as an effective and efficient clinical model through motivation toward the willingness for change for a healthy growth.