Anyone who breaks the law or breaches Party discipline will be severely punished regardless of his official rank, and "this is definitely not empty talk", said the spokesman for the top political advisory body on Sunday.
Lyu Xinhua was responding to a question about a former member of the Party's highest decision-making authority, during a news conference before the opening of the annual session of the National Committee of the Chinese People's Political Consultative Conference.
China is firmly resolved to fight corruption, and last year, 31 senior officials, some of them above ministerial level, were investigated for graft, Lyu said.
He said he has also read related media reports but refrained from elaborating.
"That's all I can say right now, and I think you understand what I mean," he said.
In one recent anti-graft case, Ji Wenlin, vice-governor of South China's Hainan province, is being investigated on corruption charges. Since December 2012, the Central Commission for Discipline Inspection, the Party's top anti-graft agency, has launched investigations into several high-ranking officials.
They include Li Chuncheng, former deputy Party chief of Sichuan province; Li Chongxi, former top political advisor of the province; and Jiang Jiemin, former head of the State-owned Assets Supervision and Administration Commission.
On Dec 20, Li Dongsheng, then vice-minister of public security, was investigated on corruption allegations.
To fight corruption and build closer ties between the Party's officials and the public, a series of policies and measures have been rolled out, in response to the public's concerns.
A sweeping anti-corruption and work-style improvement drive was launched by the Party when its new leadership took office in 2012.
"The measures have proved effective and are improving the conduct of the Party," Lyu said, adding that the improvement of the Party's work style will be a long-term, complicated and challenging task.
Huang Shuxian, deputy chief of the Central Commission for Discipline Inspection, said earlier that anti-graft authorities will show zero tolerance for corruption.
"Corruption hurts the Party most deeply, and it is the common wish of both the Party and the people that corrupt officials should be severely punished," he said in a report published on Sunday.
He said that anti-graft agencies nationwide have handled 11.2 per cent more cases than in the previous year and punished 13.3 per cent more corrupt officials in the past year.
"We have exerted high pressure on corrupt officials," he added.
During the news conference, spokesman Lyu also said that all of the CPPCC members are Chinese citizens and that dual citizenship is not allowed under China's law.
CPPCC members should cherish their title and abide by the laws, Lyu said while answering a question about the cancellation of some CPPCC memberships. Liu Yingxia, a member of the CPPCC National Committee and board chairwoman of the Harbin Xiangying Group, was stripped of her membership during a meeting on Feb 20.
On Feb 27, the National People's Congress Standing Committee dismissed two NPC deputies - Chen Anzhong, former deputy director of the standing committee of Jiangxi provincial people's congress, and Zhu Deyi, former mayor of Jixi in Heilongjiang province.
Chen was removed from his post in December for corruption.