The four-day Seventh Plenary Session of the outgoing 18th Central Committee of the CPC concluded today, state-run Xinhua news agency reported.
President Xi, who is also the General Secretary of the party, delivered a work report at the meeting.
The Congress will be convened from October 18 here.
The Congress is expected to further strengthen Xi's hold on power by stacking the Politburo and its Standing Committee
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The meeting also endorsed an amendment draft to the party constitution to be submitted to the Congress. The amendment is widely expected to see Xi's political theory added to the partys ever-expanding "guiding ideology", the Post reported.
Observers are watching to see whether Xi's theory will be named after him, meaning he would follow in the footsteps of "Mao Zedong Thought" and "Deng Xiaoping Theory", it said.
The Congress will "implement the spirit of General Secretary Xi Jinping's series of important speeches and new concepts, new thinking and new strategies on the governance of the country", according to a communique released today.
The expelled officials include Sun Zhengcai, former high-flying Chongqing party chief and the Politburo member.
The expelled full members were replaced by 11 alternate members, including Jiangsu party chief Li Qiang.
Li, 58, was Xi's top aide during his time in Zhejiang and is seen as a front runner for promotion to the 25-member strong Politburo at the Congress, which will mark the start of Xi's second term, the Post reported.
Zhu Lijia, a professor at the Chinese Academy of Governance, said the large number of seats to be filled was unprecedented.
"In the past, when the anti-corruption drive was less severe, there were far fewer Central Committee members being brought down. So usually just two or three members had to be replaced at plenums it was never on this scale," he told the Post.
The meeting also discussed the draft work report of the Central Commission for Discipline Inspection (CCDI), headed by Xis close aide Wang Qishan, 69, who carried out a massive anti-corruption drive against some of the top leaders of the previous administration like security czar Zhou Yongkong and top Generals of the military.
The 89-million-strong CPC which ruled the country since 1949, the longest party in power, has a constitutional structure but much of its leadership structure is based on conventions like two five-year terms for the top leaders and 68 as their retirement age.
Since the convention was evolved in 2002, all the leaders including the Xis predecessors Hu Jintao and Premier Wen Jiabao followed it as an unwritten rule and retired.
While the next weeks Congress is expected to further reinforce power base of Xi, who has already been named by the party as a "core leader" like founder Chairman Mao and his successor Deng Xiaoping speculation is rife whether he will break the convention and pave the way for his third term.
A total of 2,287 delegates elect the new CPC Central Committee and new CPC Central Commission for Discipline Inspection during the Congress.
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