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Background: Recently, an approach to assessing dysfunctional thinking has emerged that focuses on the form of cognition rather than its content. A cognitive style known as extreme responding has been found to predict depressive relapse (Forand & DeRubeis, 2014; Teasdale et al., 2001). Many studies demonstrated that cognitive therapy reduced relapses of depression via changes in the style rather than the contents of thinking, reducing absolutist or dichotomous thinking. But there are few empirical researches about the relation between dichotomous thinking and depression. The first purpose of this study was to explore the effect of dichotomous thinking on depression.Rumination, which consists of longer chains of repetitive, recycling, negative, and self-focused thinking is also a key cognitive or behavioral feature of dysphoria and major depressive disorder.We expected that dichotomous thinking will increase depression (Hypothesis 1). It was expected that dichotomous thinking will enhance ruminative thinking (Hypothesis 2). Our Hypothetical model are showed in Figure 1.