China is one of the largest population countries in the world In order to solve the population problem, our government carried out one child policy(政策) before. But many people not only see its advantages but also disadvantages.
From 2016, two child policy is put into effect. First of all, two-child policy is the gift for some only child(独生子). Some parents are only child and they also have only one child. When their child grows up and they grow older, their child marry an only child girl, the burden(负担)on their child and his wife is too heavy. Their child have to take care of two couples, (对；双) Usually it's a little difficult for a young couple to look after an old couple. But if their parents have two children, they can share the burden of taking care of their parents. It would be much better. Secondly, two-child policy can guarantee(保证) the number of Chinese population.
In short one child policy is already out of date(过时的；过期的)。And two-child policy is needed and necessary. It can solve the problems of today and the future.
