Introduction: Social anxiety disorder (SAD) is very debilitating disorder that disrupts many aspects of life, and in severe cases reduces a person's quality of life. Therefore, the use of unified transdiagnostic experimental therapy is essential. The present study aimed to evaluate the effectiveness of the ACT Matrix and ACT Focused on Compassion on social anxiety disorder. Materials and Method: This study was a clinical trial with a single-case experimental study non-concurrent multiple baseline design, who performed on 6 students with social anxiety disorder who were selected based on purposive random sampling. The treatment lasted for 12 sessions (60 minutes) with two-month follow-up. To compare the results of these two treatment models, the Liebowitz Social Anxiety Scale (Heimberg & et al., 1999), Self-Compassion Scale-Short Form (Raes & et al., 2011) Acceptance and ACTion Questionnaire (Second Version, Bond & et al., 2011) and the Valued Living Questionnaire (Wilson & et al., 2010) were used. Data were analyzed by visual drawing, recovery percentage, stable change index and six indicators of clinical efficiency. Findings: The results indicated that both methods of ACT Matrix and ACT Focused on Compassion reduced social anxiety (Z<-1. 96) and increased acceptance and ACTion flexibility, self-compassion, and a valuable life in the last stage of therapy and follow-up is effective and significant (Z>1. 96). Furthermore, the results of this study in the follow-up phase indicated the continuity of the effectiveness and efficiency of these two integrated interventions on social anxiety disorder. Conclusion: This study supports the effectiveness of the Matrix of Acceptance and Commitment Therapy and the treatment of compassion-focused acceptance and commitment in students with social anxiety disorder. Extended bstrACT Introduction Social anxiety disorder (SAD) is one of the most common and chronic mental disorders with early onset and continuous periods (1, 2). this is very debilitating disorder that disrupts many aspects of life, and in severe cases reduces a person's quality of life (5). furthermore, this disorder is one of the most difficult anxiety disorders in resistance to therapy and has indicated the least therapeutic effect compared to other anxiety disorders among adults and children (2, 7). in case untreated, this disorder can severely damage individual, educational, and social capacities throughout life (8). Since the fACT that people with social anxiety disorder show difficulties in regulating emotions and psychological flexibility, and also have inadequacies in intrapersonal and interpersonal functions and compassion. the use of unified transdiagnostic experimental therapies is essential. On the other hand, the lack of sufficient background in these two new integrated models, and the existence of shortcomings in clinical experiences and experimental research evidence, a comparative study between these two new models on the four variables of social anxiety, flexibility Acceptability and ACTion, valuable life and self-compassion in the form of a clinical trial with a single-case experimental study non-concurrent multiple baseline design are necessary to clarify the differences between the two intervention methods between the variables. Also determine which treatment method is more effective and more sustainable. Based on this, the research questions were designed as follows: 1. Is the ACT Matrix more effective in reducing social anxiety than that of the ACT Focused on Compassion? 2. Is the ACT Matrix more effectiv in increasing flexibility, Self-Compassion and Valuable Living than those of the ACT Focused on Compassion? Material and methods This study was registered on the Iran Clinical Trials website under No. IRCT20200816048424N1. The protocol on Matrix of acceptance and commitment therapy was developed based on the agenda (34) for social anxiety disorder by the first researcher. The researcher participated in several specialized workshops on ACT, ACT Matrix and had experience and specialty at the number 326 of the psychological system. This protocol was approved in terms of content by asking the opinion of three experts familiar with third wave therapies. The protocol on therapy of compassion-based acceptance and commitment is based on the agenda (38-40) developed by Esmaili (30). The present study was a single experimental design with asynchronous multiple baseline, being performed by purposeful sampling during 12 sessions of 60 minutes, with 2-month follow-up on six students with anxiety disorder. Such individuals were evaluated for multiple baseline, therapy and two-month follow-up during early August 2020 and mid-December 2021. Inclusion criteria were the diagnosis of social anxiety disorder, history of disorder for two years, age range 20-28 years, level of undergraduate and graduate education, satisfACTion and commitment to participate in research, not participating in other therapies at the same time. Exclusion criteria were absence of more than two sessions, a history of psychotic or bipolar disorder throughout life, a history of schizoid and avoidant personality disorders, obsessive-compulsive disorder, panic and suicidal ideation during the last six months, having substance or alcohol abuse. In order to compare the results of these two integrated therapy models, the Social Anxiety Scale (43), the Acceptance and PrACTice Flexibility Questionnaire-Second Version (46), the Self-Compassion-Short Form Scale (48), and the Life Questionnaire. Valuable (50) were used. The data were analyzed by visual mapping, recovery percentage, stable change index, and six clinical performance indices. Findings The results indicated that both methods of acceptance and commitment therapy Matrix and compassion-based acceptance and commitment therapy reduced social anxiety (Z<-1. 96) and increased acceptance and ACTion flexibility, self-compassion, and a valuable life in the last stage of therapy and follow-up is effective and significant (Z>1. 96). Furthermore, the results of this study in the follow-up phase indicated the continuity of the effectiveness and efficiency of these two integrated interventions on social anxiety disorder. Discussion The integrated intervention Matrix of acceptance and commitment therapy and compassion-based acceptance and commitment therapy teach students with pervasive and specific social anxiety to experience the hooks of the thief and threat system through the experience of perspective and perspective taking and live in the present instead of getting stuck in the sticky stories of the past and future worries. Thus, they can achieve an efficient, vibrant, and meaningful life without relying on a transient feeling and mood by becoming aware of the consequences of their interpersonal behavior, understanding the interACTion of their own and others' Matrix diagrams and functional measurement, turning their attention to perspective and unique values and individuals and focusing on the important things in life. Conclusion This study supported the effectiveness and efficiency of the acceptance and commitment therapy Matrix and the treatment of compassion-based acceptance and commitment in students with social anxiety disorder. Ethical Considerations Compliance with ethical guidelines Ethical basics observed in this study were patient consent form for voluntary participation in written interventions, observing the principle of confidentiality, informing the subjects of the research objectives, considering the health and comfort of the subjects, the right to participate or not participate in the research, holding free sessions, and the intervention of results without mentioning the names of individuals. Funding This article is extrACTed from the PhD. thesis of first author approved by the Department of Psychology, Shiraz Branch, Islamic Azad University, and its has not financial suppor. Authors' contributions Design and conceptualization: Hamid Asadi & Masoud Mohammadi,Methodology, data analysis, Ghasem Naziri,Validation, Editing: Azam Davoodi and All authors, Supervision and writing: Hamid Asadi. Conflicts of interest According to the authors, this study was conducted without any financial backing or conflict of interest. Acknowledgements I would like to thank all the volunteer students and the head of Shiva Psychology and Counseling Services Center in Tehran, Dr. Ali Ghaednia Jahromi, Dr. Mohammad Reza Shegerf Nakhaei (psychiatrist) and Mr Morteza Kazemi (assistant therapist) who In this difficult situation, the Covid 19 sincerely cooperated in all of the implementation stages of the present study.