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Background Generalized Anxiety Disorder (GAD) is a lack of explicit object-based and the specific content with fear and nervousness,whose neurological disorder correlates are poorly known,there are a cortical dysregulation in patients with GAD.The aim is to study the changes of cortical functional activity in different cerebral region on patients with GAD by eletroencephalogram (EEG) nonlinear analysis,and evaluate the relationship between serious degree of anxiety disorder and EEG nonlinear dynamics parameter.