Midfielder Deng Zhuoxiang opened the hosts' account in the 36th minute, taking a Gao Lin cross in front of goal to slot home a sweet left-footer.
Less than three minutes later, striker Gao headed home a second, nodding a Yu Hai cross from the left wing past North Korean goalkeeper Ri Myong-Guk.
In the second half the visitors - largely made up of their South Africa 2010 side - rarely threatened except for a volley by striker Jong Il-Gwan that ricocheted off the crossbar in the 80th minute.
"We want to make the most of the friendlies before the World Cup qualifiers since it will be the last training for us before the important qualifiers," said China coach Gao Hongbo.
"The two victories pave the way for our success in the upcoming qualifiers. I am really grateful to my team. We worked hard the past few days days."
China begin their Brazil 2014 qualifying campaign in July, with a match against the winner of a play-off between Cambodia and Laos. Korea DPR are direct entrants into the third round of the Asian Zone preliminries.
During their first and only appearance at a FIFA World Cup, China failed to win or score at Korea/Japan 2002.
Their failure to reach the knockout stage of the AFC Asian Cup 2011 in January further deepened fans' frustration over the inability of the world's most populous nation to succeed in the world's most popular sport.
China, however, have ended a string of five recent friendlies with a record of three wins and two draws, beating Honduras, Uzbekistan and Korea DPR, while finishing all square against Costa Rica and New Zealand.