北京市二十一世纪实验学校创办于1993年，是全国首家“政府出政策、企业出资金、专家办学校”的寄宿制新型实验学校。2010年4月，海淀区人民政府正式批复学校更名为北京市二十一世纪国际学校；2011年6月，学校举行揭牌仪式，正式转型为海淀区首家国际学校。
二十一世纪国际学校内引北京十一学校、外联美国费尔蒙特学校，通过合作办学，率先实现了先进的规章制度、管理流程、考核评价体系，以及优质的教育教学和教科研资源的共享，抢占了民办基础教育国际化的制高点。学校设有小学部、初中部、高中部、留学生部，从九十年代倡导的双语教学，到今天的中西课程优势互补，构建起集小学EP课程、初中IP课程、高中AP课程及外国学生HSK课程为一体的国际化课程体系；与美国费尔蒙特学校合作举办的中美高中实验课程项目，融合中美文化精髓于课程，提供个性化教学教育服务，使学生适应国外教学模式和学术思维，掌握学习方法和技巧，修满规定学分后可获得中美两国的高中毕业文凭，从而为进入世界名校奠定坚实的基础。
学校始终秉承“做豪迈的中国人”校训，以培养“具有中国灵魂、国际视野和跨文化交流能力的世界公民”为人才培养目标；打造小班高效课堂，通过学科整合、选课走班、分层教学，实施导师制和过程性评价，以满足学生个性化发展需求；自主研发校本教材，提供门类广泛的极具特色的选修课，开展丰富多彩的社团活动及课外实践活动，重视中青年教师培养和教学项目研究，为师生提供不拘一格的宽广而深远的发展空间。
近年来，在各级领导的亲切关怀和社会各界的大力支持下，学校取得了显著的成绩：小学生英语统测成绩优秀率高出北京市平均水平17个百分点，中考成绩迈入海淀区上游水平；高中毕业生全部赴海外留学，遍布于美国哥伦比亚、杜克、布朗、圣路易斯华盛顿、加州大学伯克利分校……加拿大西蒙菲莎、英属哥伦比亚大学、澳大利亚墨尔本大学等世界知名学府；不同肤色的外籍留学生也纷纷考入北京大学、清华大学、中国人民大学、北京师范大学、复旦大学等中国的重点大学。学校先后荣获“中国教育学会海淀教育改革试验区基础教育国际化试点研究项目学校”、“中国十大品牌私立中小学”等数十种荣誉称号，享有很高的知名度和美誉度，社会公信力和影响力日益彰显。
School Introduction
Beijing 21st Century Experimental School was established in 1993. It is the first full boarding school with Policy Support from the Government, Capital from Enterprises and Management from Experts. In Apirl 2010, Haidian Disctrict Government officially approved its name change from 21st Century Experimental School to 21st Century International School; in June 2011, it became the first international school in Haidian District and held an inauguration ceremony.
The school cooperates with Beijing National Day School (BNDS) and US Fairmont Private School (FPS), share their quality educational and research resources and establishes advanced rules and regulations, administration procedures and performance assessment system. It takes the lead in non-govermental international education. The school is divided into Primary School Department, Junior High School Department, Senior High School Department and International Students Department. It is the first to advocate for bilingual education and complementation of Chinese and western curriculum strengths, and establishes primary school EP English Class, junior high IP, senior high AP, and integrated HSK program for international students. Its China-US Double senior High School Diplomas Program with FPS integrates the quintessence of Chinese and US cultures, and provides personalized educational services, which prepares students for foreign teaching methods and way of thinking. Students of this program can get two diplomas on the basis of required credits, which lays solid foundation for their application to world-known universities.
Our school always upholds the motto of to Become a Proud Chinese, and the aim of cultivating world citizens with Chinese soul, international vision and cross-cultural communication ability. It has divided classes into small and efficient ones and integrated curriculum. It has set optional classes, introduced stratified teaching, implemented supervisor system and adopted process assessment, which satisfies personalized demand of students. The school has compiled its own textbooks, offers abundant optional classes and always encourages diversified club and extra-curriculum activities. It highlights the cultivation of young and middle-aged teachers and research programs, and provides a large and unique platform for teachers and students.
In recent years, with care from leaders at all levels and support from all sectors of society, our school has made prominent achievements: excellent rate of unified English test for primary school is 17 percentage points higher than Beijing’s average; junior high entrance examination results have been among the top of Haidian District; all senior high students have been admitted to world-famous universities, such as Columbia Univerisity, Duke University, Brown University, Washington University in St. Louis, University of California and Berkeley in US; Simon Fraser University and the University of British Columbia in Canada; and the University of Melbourne Australia. International students of all races enter China’s universities such as Peking University, Tsinghua University, Renmin University, Beijing Normal University and Fudan University. The school has been awarded the “Experimental School of international Elementary Education Pilot Program in Haidian Education Reform Experimental Zone by the Chinese Society of Education”, “Top Ten Chinese Brands of Privately-run Middle and Primary School”. It enjoys enormous popularity and high reputation. Also, its social credibility and influence are also in a rise.