Ramaphosa delivered a message of optimism and renewal after a dramatic week in which he was elected by ruling party lawmakers following the resignation of predecessor Jacob Zuma, whose tenure was marked by corruption scandals.
"We should put all the negativity that has dogged our country behind us because a new dawn is upon us," Ramaphosa said in a speech in parliament that drew enthusiastic applause.
"This is the year in which we will turn the tide on corruption in our public institutions," Ramaphosa said.
"The criminal justice institutions have been taking initiatives that will enable us to deal effectively with corruption."
More From This Section
The South African currency, the rand, has strengthened against the dollar since Ramaphosas ascent, but the new president faces the long-term problem of sluggish economic growth and unemployment of over 25 per cent.
Ramaphosa was a lead negotiator in the transition from apartheid to democracy who became one of South Africas most prominent businessmen. He now leads a government anxious to shed months of political limbo and public frustration that weakened the reputation of the ruling African National Congress party.