Television and movies ,a necessary part of life,are popular due to various genres available to us .Some people claim that controling time of watching TV and movies will offer childern an excellent performance .But I think the best way to promote their performance lies not in the hours.That depends on the TV programmes the childern are absorbing.     Those who spend their leisure time watching nature programmes ,documentaries and educational programmes,has a broader view of world.TV shows and motives make it possible for a student to broaden his knowledge base because much useful information can't be aquired from class .It's also a good tool to help students discover where their interests lies.For example ,if a student sees a documentary on space exploration,he might develop a passion for it and continue studying it in later life.A show that person watched when he was a child could possibly have been a catalyst for choosing a job .    It can be seen how certain programmes are exercising bad influence on our younth generation.One the one hand ,most cartoons and soap operas offer no useful information and kill us considerable precise time.The main disadvantage of this is that it can reduce the learning efficiency and enthusiasm.Worst of all,excessive and pornographic contents do harm to their physical and mental health.because they are too young to lack self-dicipline and judgement .They are more easier to intimate some behevior which demonstrate in the movies or programmes.For example,they may may think smoking extremely cool.But in fact,somking is an unwholesome hobby.Studies reveal that there is a definite link between smoking and serious diseases such as lung cancer.    Admittedly ,to limit the hours of watching TV and movies is also a means because they become more focused on their study.However,there are other factors should be taken into account ,such as individual efforts,parents' encouragement and patience ,educational environment ,etc.If a student with little interests of learning spends few hours on watching TV,he can't get good marks.Therefore,I still hold my point that students can benefit from educational programmes.Conversely ,some wrong TV shows and movies can be dangerous .Young people should keep away form them .