Nowadays, in many countries, yong people leave rurals areas for studying and working in cities. There are many causes for this trend and it also leads to many effects. First of all, people leave rural eraes because they want to study in prestigious universities. Therefore, after graduating, they will get a good job and a good life. Secondly, there aren't enough jobs in the countryside and the quality of life is still poor so people tend to move to cities with the expectation that they will have a better life. Obviously, this leads to many effects, include good effects and bad effects. More people move to the city for studying and working which means both intellectual standard and the quality of life increase. However, this causes the imbalance of population between rural areas and cities. Too many people in the city also leads to the unemployments and increase the rates of social evils. In conclusion, there are many causes of this trend and it also leads to many effects.