The main hazards of watching TV for a long time to children are: leading to lower vision, affecting the quality of sleep, and unfavorable to the development of athletic ability. 1. Lead to lower vision: children watching TV for a long time, easy to cause eye fatigue, if the child’s eyes are in a state of fatigue for a long time, it is easy to lead to lower vision, and may even gradually form myopia. 2. Affect the quality of sleep: children watching TV for a long time, especially before going to bed for a long time to watch TV, easy to lead to increased neural excitability, may affect the quality of sleep, for the child’s healthy growth may have a negative impact. 3. Unfavorable to the development of athletic ability: children due to long hours watching TV, resulting in reduced activity, if long-term sustained interest, is likely to lead to a reduction in the coordination of the child’s body, the development of athletic ability to have a negative impact. Children watching TV for a long time is more harmful, therefore, parents should control the time of their children watching TV, and when they find that their children have vision and other problems, they should seek medical attention in time.