Australian executive Hu and three other Chinese employees had been in the dock in a Shanghai court since Monday on charges of bribery and stealing trade secrets, amid concerns about whether they are getting a fair trial.
All four defendants in the high-profile case are said to have admitted taking money, although they have challenged aspects of the charges.
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"It has just ended," said Yang Bailin, who is representing Rio employee Wang Yong.
The lawyer declined to comment on when the court might deliver its verdict.
Earlier, on Wednesday, Australian Prime Minister Kevin Rudd said consular officials were continuing to monitor the trial.
"It's not just Australia that's watching this trial very closely, but the eyes of the world are focused on the way in which this trial is conducted and what happens as a result of it," Mr Rudd said.
