1. International Youth Science Olympiad (IJSO) : This is an international science competition for junior high school students, integrating the three major subjects of physics, chemistry and biology in the field of natural science. Each competition question may span three major disciplines. The content of the competition questions includes three parts: multiple-choice test, theoretical test and experimental test. The top 10% of the total score will be awarded gold MEDALS, the next 20% will be silver MEDALS, and the last 30% will be bronze MEDALS. In addition, there are four special awards: the Experimental award, the best theory award, the highest total score award, and the national award. The Chinese mainland team has been participating in the IJSO competition since 2014.

2.RoboCup Youth World Cup: It is an international science popularization activity for teenagers, oriented towards technological design and practice. Its aim is to cultivate teenagers' international vision and technological innovation ability, and promote friendly exchanges and cooperation in the fields of science and technology and culture across borders. This event has become the largest international youth robotics competition at present and has been held in Japan, Australia, Italy, Portugal, Germany, the United States, China and other places. The competition events include robot football matches, robot rescue competitions, robot dance competitions, etc.

3. International Science and Engineering Fair (Intel ISEF) : Founded in 1950, it is held in different cities across the United States every May and is an international youth scientific research project competition with a history of 58 years. It is aimed at students in grades 9 to 12 (junior high school grade 9 to senior high school grade 12), and the competition subjects cover all natural sciences and some social sciences. In addition to setting up 17 subject awards, the competition also established special awards and government awards, totaling over 600 individual and collective awards. In addition, there are scholarships worth over 1.5 million US dollars provided by Intel Corporation, the Science Service, and nearly 70 sponsoring enterprises, scientific societies and the government, as well as summer internship research, field scientific expedition opportunities and experimental equipment. Each year, 2 to 3 winners of the competition will be given the opportunity to attend the Nobel Prize award ceremony in Stockholm, Sweden.

4. Macao International Youth Science and Technology Practice Competition: It is a public welfare international education cooperation project, mainly assessing the contestants' comprehensive abilities such as situation analysis, algorithm design, modeling and assembly, debugging and optimization, as well as collaborative expression, aiming to cultivate outstanding innovative talents in science and technology practice. This competition is divided into two major themes: the pre-set competition and the real-time challenge competition. Contestants need to complete the real-time tasks within the specified time, make presentations to the experts, and answer questions on the spot.

5. The International Robot Olympiad (IRO for short) is an international robot competition organized by the International Robotics Olympiad Committee (IROC). This event was founded in 1998 and the first competition was held in 1999. It was conducted under the guidance and supervision of UNESCO, providing students with a platform to exchange science and technology. The IRO International Robot Olympiad focuses on enhancing the robot skills of young people, vigorously developing robot education, popularizing robot culture, and cultivating their innovative spirit, engineering thinking and practical ability. Contestants can acquire more abundant knowledge about programming robots through the competition and cultivate their abilities to learn, explore, research and practice in multiple disciplines such as engineering, electronics, information and automatic control.