I have proposed to my girlfriend. What should I tell her parents?

Of course, go back and say it in person to show their respect. So they will think that your future son-in-law still attaches great importance to them. You can talk about your work, living environment and economic situation. Parents? Daughter happiness is the most important thing. Having a stable job and financial ability will make them feel that their daughter will not suffer if she marries you. Listen to his parents' opinions when you speak, don't just say your own words, no matter how ugly they are.