The market scale of K12 online education will be further expanded in the future, where there existed the supporting policies and advanced AI technology. As the data of iiMedia Research showed, online subject tutoring is still the main demand of K12 online education users. Over 80% of online education users were subject tutoring users. Among all the subjects, English and Math were the two most popular subjects. More than 60% of K12 online education users were satisfied with the achievement enhancement effect of online subject tutoring. In spite of online subject tutoring, online education industry started to pay attention to the market segment of the quality education. K12 programming was the most popular extracurricular lesson, accounting for 22.8%. The followings were painting and vocal music. Although the online education industry was growing to be gradually mature, there were still differences in the cognitive level of K12 online education in various cities. The proportion of K12 online education users in first-tier city (50.4%) was significantly higher than the proportions of the second and third-tier cities (35.6% and 21.1% respectively). Facing the large amounts of development opportunities in third-tier and fourth-tier cities, the industry is showing a downward trend. At the same time, K12 online education industry was adjusting itself to cooperate with the offline education, and trying to solve to the pain points of having difficulties in following up the progress and lacking of real class atmosphere.