High Court judge Wilson Chan is facing another accusation of making extensive use of other people's words in his rulings, after receiving a serious reprimand from Hong Kong's top judge over copying in a separate case.

The Court of Appeal on Wednesday heard a civil case between two sons of the late co-founder of real estate firm Great Eagle Holdings, Lo Ying-shek. The appellant Lo Kai-shui questioned if Chan had independent thinking when handling the case, since he said the judge had incorporated extensively from his brother Lo Ka-shui's submissions in his ruling.

The Court of Appeal said it will make a judgment after considering relevant evidence on its own, and would give no weight or very little weight to Chan's judgement.

The national security judge had already received a serious reprimand from Chief Justice Andrew Cheung after the Court of Appeal ruled that he had plagiarised the plaintiff's submission in his ruling on a trademark case. A retrial under a different judge was also ordered.

The Judiciary said such acts were unfair to both parties and also affected public confidence in the courts.