President Omar Al-Bashir has delegated his powers as the head of the ruling National Congress Party, NCP, to its recently appointed deputy head, Ahmed Mohamed Haroun.
There have been more than two months of widespread protests calling for Bashir to step down but he is not giving up his presidential powers.
Demonstrations have continued despite a nationwide ban; at least 30 people are known to have been killed in the protest.
The NCP said Haroun, who is wanted by the International Criminal Court, ICC, for alleged war crimes in Darfur, would remain in charge until the next general conference.
Last week, Bashir dissolved the government and declared a state of emergency, giving the armed forces more power.
However, opposition politician, Mubarak Al-Fadil, said the president’s ceding of power would not appease the protesters. The president is believed to have ceded powers to the armed forces for self-protection.