His girlfriend is Dong Hongfen from Nianwa Village, Paoche Town, Pizhou City. Her family threatened her to break up with me and not let her see me. Please help me.

Such parents are really ignorant. I sympathize with you. Now there are two ways to do this:

First, you ask your family and friends for help and go to his house to save her.

Second, it is meaningless to call the police and reason with such unreasonable parents. Any behavior that restricts personal freedom is illegal, and parents are no exception. They violated the law by restricting her personal freedom. The police will handle it. You can take this as a fact, ask the police for help to explain the truth, and then run away with her and live together. It's the only way, brother. Good luck!