Legal analysis: When the court only enforces the principal of the arrears, the basis for the court's enforcement is the effective legal document. If there is a ruling on the principal of the arrears or related interest in the effective legal document If there is only the principal or interest, the court can only enforce the principal or interest based on the content of the legal document, and not both at the same time. Execution of arrears of principal and interest.

Legal basis: Article 236 of the "Civil Procedure Law" states that the parties must fulfill any legally effective civil judgment or ruling. If one party refuses to perform, the other party may apply to the People's Court for enforcement, or the judge may transfer the matter to an execution officer for enforcement. The parties concerned must perform the mediation agreement and other legal documents that should be executed by the People's Court. If one party refuses to perform, the other party may apply to the People's Court for enforcement.