Nowadays, Internet has become an important part in the modern life. Besides the advantages, it also brings about many disadvantages that no one expects. First, Internet is so addictive and time-consuming. Using it sometimes makes you lose your sense of time and easily deep in meaningless things. For example, when you start studying at 7 o’clock, you have intention of using Internet for doing homework but then you are addicted to the entertainment websites and can not stop. As a result, it takes you a lot of time to finish work and makes you lazier and lazier. Second, some social networking sites contain potential risks, because they are not strictly controlled. Some websites can report the false and reactionary information, other ones even can take advantage of your belief then make money illegally. Last but not least, Internet affects harmfully to your health. It is undeniable fact that your vision is shorten so much when you use smartphone or computer so much. Moreover, it also results in some diseases, which relate to memory and skeleton, especially promote the senescence faster. Taking into consideration, Internet is not bad but everyone should uses it reasonably and effectively.