Adopting the world's leading strategic model of trinity of Ai engine, content and service, Squirrel AI connects online and offline, uses the core technology of AI, and builds a K 12 universal tutoring intelligent system to teach students in a mixed dual-teacher mode. Squirrel Ai intelligent adaptive learning system, with the mode of artificial intelligence+real teacher, can not only realize student-centered intelligent and personalized education, but also apply artificial intelligence technology in the teaching process of testing, learning, practicing, testing and answering.