Chinese law enforcement authorities are working with the United States on the cases of the five most-wanted corrupt Chinese officials living in the US, a senior anti-corruption official said.

China is seeking US judicial assistance in repatriating the five - four of whom are still at large - to China to face trial, said the senior official with the International Cooperation Bureau of the Central Commission for Discipline Inspection.

"We are negotiating with our US counterparts on the five major corrupt fugitives, including Yang Xiuzhu, who is suspected of illegal immigration and is in custody awaiting deportation proceedings," said the official, who requested anonymity. "And we have decided to conduct joint investigations of the major cases."