With the world in the progress of medical technology， the population of the world is more and more。 Some people say， people is a good thing， people more power。 But many people also will cause a lot of problems。 The growing population， needs food more and more。 But the world's resources are limited。 People dwellings to place is more and more small， brought serious burden to the world。 We should be the promotion of family planning to control the population growth。