Due to the rapid development of science and living tempo quickens, face recognition has been thrown in sharper focus. So what’s the purpose to invent face recognition. It can make our life convenient. For example,when you go out and buy a bag of chips, you need to take nothing but your face, even enter a house without a key of your gate door. But it is also a double-edged sword. If bad guys use dark technology to copy your face ,you might be in danger.Finally,face recognition is a high and useful technology, but it still need to be improved.