Abstract: In winter of 2020, government delayed the opening of schools because of the pandemic of COVID-19. In order to regulate children's mood, parents provided their children with the chance to use electronic products such as mobile phones. Educational systems across the country organized students to take part in online learning. Screen teaching is helpful for children to complete learning. But some children require an additional use of mobile phones or electronic products for entertainment and games. However, a longtime screen use will bring negative influence on psychological behaviors of children and affect their growth. In order to protect children, schools should set up online courses reasonably according to children's physical and mental characteristics. And parents should enrich home activity to meet the needs of children and take effective measures to minimize negative impact to children.

Key words: children, behavior psychology, growth, screen teaching