Recently, increasing number of parents show much cares about the influence televisions have brought to their children. In the modern society, TV was the most popular appliances in each family. As they are easily accessible to the children, people worried about whether watching TV could benefit children. Someone says that TV maybe good to children because children like TVs. Some others believe that watching TV would have negative effect on children. As far as I am concerned, watch TV could be bad to children for television would mislead children and do harm to their growth. 
First of all, watching some inappropriate TV programs could lead some children to the wrong ways while they are growing. If the TV program were full of violence and crime, children who have strong mimic ability would simply imitate the behavior, therefor, become dark and even criminals. A good example for this is the accelerating crime rate in the group of adolescent. A research indicated that many children's lapses were just came from mimicries of the actors in TV. In this research report, we could make sure that children's ability of self-restrict are relatively weaker than that of the adults, therefore, they probably could not discrete behaviors in the TV program, which may lead a high crime rate among the youth. 
In addition, even though the children could recognize whether the program is good or not, if they keep on watching for a long time, negative effect would also bother them because this seems to threaten children's health. Children are usually easy to be addicted to TV programs, which would make them sitting in chair for many hours. Thus, unlike children before when we have not TV, adolescents now spend less time on outdoor exercises, or at least, playing outdoor. however, both of these activities could be benefit to their health. What is worse, sitting in a chair in the room for a long time tend to do harm to the immunity system as well as eyes. My little brother presents a example of that. When he was at primary school, he was so into a comic program on TV, and could not stop watching it every day. After only a semester, he became myopic and frequently got cold. The doctor just recommended him do more exercises and do not sit in front of the TV for that long. So, TV really bring unhealthy to the youth.
In fact, granted that TV does bad to children, however, just forbid them to watch TV would not be a favorable. Now in the modern world, various of TV programs do contribute to broaden children's horizon. No one could deny that the multimedia way's considerable advantage in teaching children for its easier for them to receive. Nevertheless, watching TV would have negative effect on the communication ability of children. During watching, many children incline to sitting their without a word with others, which severely affects the developing of their social ability. I would take my own experience as an example. I really love TV and I used to devote my whole spare time watching when I was a child and avoid extra talks to others. As a result, when I became a grown man, I found myself feel hard to talk to strange people. Consequently, TV would be bad for adolescents if they were not controlled.
In conclusion, as negative TV programs inevitable exist on TV, and children are too premature to control themselves to be not addicted to watching TV. Leave the children watching TV without any restrict would be really bad to them because TV could jeopardize their health as well as the social skills. Consequently, parents should pay more attention on their children about what and when they enjoy things on the screen.