Onion mathematics makes every student "understand as soon as he learns"! Onion Mathematics is an online mathematics learning tool 1, which combines micro-lessons with exercises to enable middle school students to learn individually easily and efficiently. Onion Mathematics makes the knowledge points in the national junior high school students' syllabus into a series of video courses (synchronized with the teaching materials). Each video explains a certain knowledge point in the syllabus in detail with interesting video language, and exercises are interspersed in the video to ensure that students will continue to watch the video after understanding a concept until they fully grasp the course content. Then there will be after-class exercises and chapter tests, and the wrong questions will automatically enter the wrong book for students to review later. Co-founder Zhu Ruochen, Biology, Education and Psychology, Duke University, USA; Specializing in cognitive science and electronic learning; For many years; Co-founder and course director of Sunshine Book House II Rural Informatization Education Action. Co-founder Yang graduated from Harvard University and worked in Boston Consulting Group for a long time, studying the combination of Internet and education. Co-founder and executive director of Sunshine Bookstore Rural Informatization Education Action III.