Career
He has refereed internationally in the AFC Asian Cup, Tiger Cup, and qualifiers for the 1998, 2006, and 2010 World Cups. Sun officiated the 2001 Fédération internationale de football association World Youth Championship, taking charge of the opening match between Argentina and Finland. He is also a referee at the AFC Champions League and Chinese Super League.
During 1999, Sun also spent a stint in Major League Soccer as part of a referee exchange program
