Observers say the anti-corruption drive lacks transparency and has been used to cement Mr Xi’s grip on power by removing potential opponents.
A golfer on the oldest golf course in Beijing with local female caddies Lionel Derimais / Alamy Stock PhotoBut it remains popular among ordinary Chinese who are angered by high-living officials in a country which has sharp divisions of wealth.
“The new discipline regulation explicitly lists extravagant eating and drinking and playing golf as violations, which were not included previously,” Xinhua state news agency said.
“Improper sexual relationship with others” would also lead to being sacked from a party position, said the People’s Daily newspaper, which is the official mouthpiece of the party.
Other rules include forbidding members making “articles, speeches or announcements to support bourgeois liberalisation”, it added, in a list of regulations filling almost two full pages of Thursday’s paper.
The rules were adopted on October 12. It was unclear why they were only made public on Thursday.
They call for China’s 87.79 million Communist Party members to "champion simplicity and guard against extravagance", and were an update on existing rules released in 2010, Xinhua said.
The new clause against "improper sexual relationship with others” is a stricter revision of an existing regulation against “keeping paramours and conducting adultery”, the news agency added.
Chinese President Xi Jinping and his wife Peng Liyuan arrive for a four-day state visit at Heathrow Airport Toby Melville/Getty Images
Allegations about improper sexual relations have been used against senior officials in a number of recent high-profile graft cases, including those against Bo Xilai and Zhou Yongkang.
The eating habits of officials have also come under scrutiny from the media and the public in China.
Mr Xi has launched an austerity drive which includes a campaign for simple meals with the catchphrase “four dishes and one soup”.