Chinese President Xi Jinping has ordered China's military to be ready for war "at any second".
The order is Mr Jinping's first since the start of the New Year, as he stressed for a need for "full-time combat readiness".
He also said the People's Liberation Army should be ready to polish troop capabilities.
It comes as the country's armed forces began military training and exercise on Monday.
Under Mr Jinping's orders, he has said the PLA must add technology to its exercises, reports South China Morning Post.
"[The PLA must] increase the integration of new equipment, new forces and new combat realms into training and combat systems," he said.
Implementing more technology includes the use of computer simulations and developing hi-tech knowledge.
In 2020, the Chinese military faced its worst conflict with India in years.
The violent face-off took place at the southwestern border region and more than 20 Indians died.
However, the number of Chinese casualties was undisclosed.
Last year China also targeted Taiwan after stepping up its exercises and air force fly-by operations.
Earlier last week China was reportedly furious over the UK Navy's "plans to deploy a warship in disputed seas".
The Royal Navy has been tipped to send the HMS Queen Elizabeth to the South China Sea amid growing fears over China's surging military might in the region.
The country says it will take action to "safeguard its sovereignty, security and development interest as well as peace and stability in the South China Sea".
China's defence ministry spokesman Tan Kefei told a press conference: "The Chinese side believes that the South China Sea should not become a sea of great power rivalry dominated by weapons and warships.
"The real source of militarisation in the South China Sea comes from countries outside this region sending their warships thousands of kilometres from home to flex muscles."