Fighting against corruption and upholding integrity will be high on the agenda of the 18th National Congress of Communist Party of China, Cai Mingzhao, spokesman of the congress said on Wednesday.

"The issues of Bo Xilai and Liu Zhijun occurred at senior levels within the Party and are serious corruption cases; the lessons were extremely profound," Cai said, answering a China Daily reporter’s question.

“No matter who they are or how high their rankings are, as long as they are engaged in corruption, they have to be investigated and punished.”

China is in the middle of social transition, and some areas are prone to corruption, corruption punishment and prevention is a long-term and arduous task for the Party.

Cai also said the Communist Party of China Central Commission for Discipline Inspection is now drafting the 2013-2017 working plan to further enhance the anti-corruption system.