A friend's son can get a red envelope of 500 to 1000 yuan in Tsinghua. When a friend's son is admitted to Tsinghua to get a red envelope, he needs to show congratulations and make sure that he has the ability to pay the amount of the red envelope, so as not to bring too much burden to himself. A red envelope of 500 to 1000 yuan is a common amount range, neither too much nor too little, which is very suitable. But if you are close friends, you can give them a bigger red envelope to show your attention and blessing to their children.