Career
Sun joined Hangzhou Greentown youth team system from Qingdao Hainiu Football School when he was a teenager. He started his professional football career in 2011 when he was snet to China League Two club Wenzhou Provenza (Hangzhou Greentown youth team) for one year. He played 10 times in the 2011 league season.
Sun was promoted to Hangzhou Greentown"s first team squad by Takeshi Okada in 2012.
In 2012 season, he mainly played in the reserve league and made just two appearances in the. In July 2014, Sun moved to China League One side Beijing Bureau International du Travail or ILO on a six-month loan deal.
In February 2015, Sun was loaned to League One side Shenzhen Football Club for one season. Sun played for Chinese under-17 national team in the 2010 AFC U-16 Championship.
He played two matches in the group stage and was sent off in the second match against United Arab Emirates.
In October 2011, he was called up into China U-20 squad for 2012 AFC U-19 Championship qualification. Although China U-20 qualified into the 2012 AFC U-19 Championship, he was sent off in the last match against Australia with a flagrant foul, which team manager January Olde Riekerink considered it as a disgraceful action and said he would never call up Sun for the U-20s squad in the future. However, Riekerink took back his words and Sun received another called up for the 2012 AFC U-19 Championship.
He played two matches in the championship as China were eliminated in the group stage after losing all three matches.