Career
Han Dejun signed his first professional contract with Chinese Basketball Association side Liaoning Flying Leopards and was used sparingly in his debut season, averaging 1.2 points per game and 2.6 rebounds per game. He would see a steady increase of playing time throughout the next couple of seasons an averaged 13.1 points per game and 7.7 rebounds per game in the 2011-2012 season. Prior to the beginning of the 2012-2013 season, there was speculation that Han was set to leave Liaoning to join the Beijing Ducks.
Both Liaoning and Beijing denied these claims and in the end, Han signed a two-year contract extension with his team
He then proceeded to score 23 points while grabbing 9 rebounds in a road loss to the Shandong Lions. In May 2010, Han was selected to participate as a preliminary squad member for the Chinese national basketball team
Han, along with four of his club teammates, was selected to participate as a preliminary squad member again in 2012.