Introduction: Generalized anxiety disorder is of various types anxiety disorders, that are defined excessive anxiety and worry mental uncontrollable.

Methods: This study is a clinical trial of quasi-experimental research which pretest-posttest control group design was used. The study population included all patients with a diagnosis of generalized anxiety disorder referring to is the one of the military hospitals, among them, 24 people using the random sampling method were selected. The instruments used in this study were the Meta-worry Questionnaire (MWQ), Thought Fusion Inventory (TFI) and meta-cognitiveTherapy package and data were analyzed withunivariate analysis of covariance (ANCOVA).

Results: The findings suggest that meta-cognitive therapy is effective for metaworry and thought fusion in patients with generalized anxiety disorder. Based on the analysis results, the 0/546 of variance Reduction meta-worry and also 0/362 of variance Reduction thought fusion In the post-test Explained by meta-cognitive therapy And significant effect of the experimental group is confirmed.

Conclusion: Cognitive techniques reduce automatic negative thoughts and dysfunctional attitudes that provide reducing metaworry. Meta-cognitive therapy also improves cognitive biases that may lead to a reduction in the thought fusion. The implicit reference of this study is that health authorities should try to consider this therapy as a therapy in this area.