The ability to successfully regulate one’s own emotions is one of the most significant markers of mental health and level of psychosocial maturity. Therefore, the study and development of methods of assessment of emotion regulation is an important task in clinical psychology research. This article reviews methodological difficulties in conceptualizing process of emotion regulation and methods of assessment. The reviewed methods included Difficulties in Emotion Regulation Scale, Cognitive Emotion Regulation Questionnaire, and Emotion Regulation Questionnaire. Experimental methods included Stroop task with emotion stimuli, manipulation of emotion regulation strategies, emotion regulation implicit attitude test.