Little is known about the circumstances of the beating, including where it happened or whether any law enforcement authorities are investigating it. Ms. Nakaura suggested in a later Instagram post that it had taken place a month earlier. She has since deleted her Instagram account.

An entertainment industry agent who said she represented Mr. Jiang, declined to comment.

The episode has again put a spotlight on domestic violence in China, where recent legislation has made it easier for victims to come forward, but experts say much remains to be done.

“More women have found the courage to ask for help, including making charges and issuing protection orders,” said Feng Yuan, a co-founder of Beijing Equality, a women’s rights nonprofit. “The problem now is that the training of police, prosecutors, lawyers and judges has not kept up.”

A number of state-controlled news media outlets published editorials this week about Ms. Nakaura’s case, condemning domestic violence and encouraging victims to report it to the police.

In China, family and public pressures often compel victims to stay silent, or they are dismissed by the local authorities when they do come forward. Still, the situation has improved in the years since Kim Lee, an American woman, accused her Chinese celebrity husband of abusing her.

In her highly publicized 2014 divorce trial, Ms. Lee received the first personal protection order ever issued in Beijing. That was followed by a landmark domestic violence law in 2016, which made it easier for women across China to obtain such orders.

CGTN, the Chinese state news agency, recently reported that 1,830 protection orders had been issued since 2017. But restraining orders are difficult to carry out and few are actually enforced, according to Leta Hong Fincher, author of “Betraying Big Brother: The Feminist Awakening in China.”