The ruling party's Central Committee announced a series of moves to centralise power and combat corruption following its Fourth Plenum meeting in the capital, saying it was pursuing the "rule of law with Chinese characteristics".
"The leadership of the Communist Party of China is a fundamental requirement for building the rule of law," Guo Yezhou, vice minister of the central committee's International Department, told reporters at a briefing.
"In order to keep the leadership of the Communist Party of China, we must depend on the development of rule of law in the country," he continued.
The 16,000-character statement issued after last week's plenum, stressed that Communist leadership "must be adhered to", listing the party above equality before the law and upholding the rule of law.
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Henry Gao, an expert on Chinese law at Singapore Management University, told AFP that compared with his predecessors, party chief Xi Jinping is less "hesitant" about emphasising the organisation's supremacy.
"You could argue that rule of law is inconsistent with the leadership of the party, because if you really want the law to be supreme, then nobody should be above the law, including the party," he said.
"Xi somehow now has this confidence in the leadership of the party -- in the ability of the party -- that he's out telling the world, 'You may not like it, but the party is in charge.'"
Authorities had been expected to reveal a decision on the fate of Zhou Yongkang, the powerful former security chief ensnared in Xi's anti-corruption drive.
But there has been no declaration yet about Zhou, whose investigation was announced in July, and officials said Thursday only that the details will be released "in due time".
He added that the handling of Zhou's case "demonstrates the determination of our party to fight against corruption".