實皆省
In 2012, he was elected as member of House of Nationalities following the 2012 Myanmar by-elections. In the 2015 general election, Myint Naing ran for Sagaing Region Hluttaw and was re-elected. In 2016, he was appointed as Chief Minister of Sagaing Region by the President of Myanmar with the recommendation of Sagaing Region Hluttaw.