Legal analysis: Yes, the mediation document will become legally effective after it is signed by both parties.

Legal basis: "Regulations of the Supreme People's Court on Several Issues Concerning the Civil Mediation Work of People's Courts" Article 13 According to the provisions of Article 90, Paragraph 1, Item (4) of the Civil Procedure Law, the parties Agree to a mediation agreement shall become effective upon signature or seal. After review and confirmation by the People's Court, the agreement shall be recorded in the transcript or attached to the file. It shall be legally effective after it is signed or sealed by the parties, judges, and clerks. If a party requests the preparation of a mediation document, the people's court shall prepare a mediation document and send it to the parties. If the parties refuse to accept the mediation letter, the validity of the mediation agreement will not be affected. If one party fails to perform the mediation agreement, the other party may apply to the People's Court for enforcement with the mediation letter.