In reporting the 22 annual maneuver, which it described as "a normal routine annual rotation", the news agency said PLA troops "have grasped the ability to defend Hong Kong".
Almost three months of fiery anti-government demonstrations have sparked concerns that the military will be deployed in the semi-autonomous Chinese city. "They will effectively carry out the duty of defending Hong Kong, and perform more new contributions to maintaining the prosperity and stability of Hong Kong", Xinhua said, echoing comments made earlier this month by Chen Daoxiang, the commander of the PLA garrison in Hong Kong.
Troops stationed in Macao, another special administrative region, also completed a rotation Thursday.
The anti-government rallies in Hong Kong have frequently escalated into violence between police and activists, with injuries on both sides.
Analysts estimate the garrison numbers between 8,000 and 10,000 troops split between bases in southern China and a network of former British army barracks in Hong Kong.
The Civil Human Rights Front, the organizer of previous mass protests in Hong Kong that they said attracted up to two million people, plans a rally from Central to Beijing's main representative office in Hong Kong on Saturday.
However, demands of demonstrators have grown and the protests themselves have become more violent, prompting officials in Beijing to issue stark warnings of a possible crackdown.
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China has been accused of using intimidation, economic muscle and propaganda - including against Hong Kong airline Cathay Pacific as well as the city's metro operator - to constrict support for the protests.
The American Chamber of Commerce (AmCham) said Hong Kong faced an unprecedented test of the "one country, two systems" formula it has been ruled under since 1997.
"It is totally unjustified because the police in Hong Kong should match at least the level of threat posed by the violent demonstrators", he said.
Permission for Saturday's mass rally was denied by Hong Police on security grounds, raising the likelihood of another weekend of clashes between police and protesters, who will likely come out in defiance of the ban. "If the protests are not stopped early, they will grow more and more widespread and more and more violent and that becomes much more hard to control", he said. CHRF convenor Jimmy Sham Tsz-ki said the group would appeal against the decision.
The protest will mark five years since Hongkongers called for universal suffrage during the 2014 Umbrella Movement.
Protesters targeted the Liaison Office, a potent symbol of Beijing's rule, in July, daubing anti-China slogans on its walls and signs.
A former British colony, Hong Kong was returned to China in 1997 under the "one country, two systems" framework, which promises the city certain democratic rights that are not afforded to the mainland.
Beijing is eager to quell the unrest before the 70th anniversary of the founding of the People's Republic of China on October 1, when Mr Xi will oversee a large military parade in the Chinese capital.