Hello, my answer to your question is that the second instance of civil litigation is not a review, but a procedure in the second instance. The review in the second instance procedure is a dual review of specific administrative acts and judgments in the first instance.
Civil Procedure Law of the People's Republic of China
The provisions of Article 168,
The people of second instance shall examine the relevant facts and the application of law of the appeal.
Article 169 The people of second instance shall form a collegial panel to hear an appealed case. After reviewing the files, investigating and questioning the parties, if no new facts, evidence or reasons are presented, and the collegial panel considers that it is unnecessary to hold a court session, it may not hold a court session.