The legal amendments would allow the extradition of people, including Australians living or travelling through Hong Kong, to mainland China for suspected criminal acts.

Senator Wong is also concerned about the message the laws would send to foreign companies operating in Hong Kong.

"Those are matters that I would assume, and I would hope, that the Hong Kong authorities would take into account," she told ABC radio on Tuesday.

"I would also hope that the Australian government would be expressing these views about the potential implications for Australians from these proposals."

Foreign Minister Marise Payne said the government was taking a "close interest" in the extradition bill, including its impact on Australians.

"The Australian consul-general in Hong Kong has raised the issue with senior levels of the Hong Kong government," her spokesman told AAP.

Hundreds of thousands of people took to the streets of Hong Kong at the weekend to protest the legislation.

"We respect the right of people to protest peacefully and to exercise their freedom of speech," the minister's spokesman said.

Greens leader Richard Di Natale is concerned the extradition laws will undermine Hong Kong's legal system and expose people to China's "unjust" regime.

"We all know that China's judicial system is deeply politicised. The right to a fair trial is chronically denied and defendants often face ill-treatment and torture," Senator Di Natale said.

"People unjustly mired in China's judicial system have little to no hope of redress.

"The Chinese government still hasn't aligned its key criminal laws and policies with international human rights standards."

Australian Associated Press