Little is known about the professional career of Jong Myong-do until 1997, when he was promoted to a two-star general. Member of the Supreme People's Assembly, the unicameralparliament, from the 10th convocation.
In December 2007, he was promoted to the position of Navy Commander of the Korean People's Navy with the promotion of three-star colonel general. He served in that role until July 2012, when he was replaced by Kim Myong-sik. From that moment, he appeared many times alongside Kim Jong Il during numerous visits to military units.
After the death of the Supreme Leader Kim Jong Il in December 2011, Jong Myong-do was in 65th place in the 232-person Funeral Committee.[1][unreliable source?] This testified to the formal and actual belonging of Jŏng Myŏng to the close political leadership of the Democratic People's Republic of Korea. According to specialists, places on such lists defined the rank of a politician in the hierarchy of the power apparatus.[2][3]