清华附中国际部模拟联合国社团成立于建校之初的2009年，由学生主导，是学校里建立时间最长的社团之一。THIS-MUN致力于开拓同学们在各类国际事务中的视野、激发专业写作潜能和锻炼领袖才能。在每周的社团活动中，同学们都会接触到很多社会热点话题，例如和平与安全、贫困与发展、人权、环境、公共卫生、全球化等，社团成员和老师引导同学们用国际化的视角来看待问题、思考问题和讨论问题。
Established in 2009, THIS-MUN is a student-led club, and one of the oldest clubs at the school. It is dedicated to developing students’ perspectives on various international affairs, stimulating their professional writing potential, and practicing their leadership skills. During the weekly club sessions, students are exposed to global challenges, such as peace and security, poverty and development, human rights, environment, public health, globalization and other topics, aiming to guide students to understand, think and discuss the issues with an international perspective.
THIS-MUN发展的十余年来，成员们一直活跃于各大会议的赛场上，在辩论中展现出了精湛的口才，在与外校的学生合作时表现出了优秀的组织力和领导力，在演说时将在课堂中学到的历史、政治和文化等知识融会贯通，活学活用，体现出了对各类会议议题的充分理解、丰富的知识储备和扎实的文化底蕴。带着这些特质，清华附中国际部模联人在参赛时获奖无数，更重要的是，同学们自身对知识的理解在独特的会议经历中也得到了深化，全球视野得到了扩展，综合素质得到了提升。
For more than 10 years, members of THIS-MUN have been active in many conferences, demonstrating eloquence in debates, and leadership when working with students from other schools, and integrating and applying the historical, political, and cultural knowledge they have learned at school to their speeches. Also, they demonstrate a full understanding of the various conference topics and global issues, showcasing their rich knowledge base and a solid cultural background. With these qualities, THIS students have won many awards and, more importantly, their understanding of global affairs has been deepened.
