The computer is the most important invention of 20^th century. It has developed fast and has great changed people’s life since it appears. It can do a lot of things and store a large quantity of informations, but it is widely used in industry, agriculture, education and so on. The computer is played a more and more important role in education in China. Many schools are equipped by computers. Students could have computer lessons. Because of computer science is important, computer competitions are often held in school. Now the computer has come to everyone’s life. It is important of us to learn computer science well.