Based on data of the “Survey of Out-of-School Life of Children in China”，this report analyzes the out-of-school life of children in kindergartens，primary schools and junior middle schools. The results show that in their out-of-school life on holidays，children are looked after mainly by their parents and grandparents. They participate more in out-of-school lives such as taking extra-curriculum classes（including interest classes，tutoring classes and other classes），visiting relatives/friends and traveling，and the majority of them report that they can get enough sleep on holidays. Children from urban areas and advantaged families participate more in out-of-school activities on holidays. Compared with interest classes，children have a preference to tutoring classes. Children have different out-of-school life choices owing to their grades or whether their parents are migrant workers. Generally，children who have participated in out-of-school life on holidays perform better in terms of physical fitness，psychological development（curiosity，imagination，self-efficacy，and resilience）and social skills. However，the visual acuity of children who participated in taking extra-curricular classes is usually deteriorated.