 She was among the favorites for the hurdles at the 2010 Asian Games, but it was Korean Lee Yeon-Kyung who went away with the gold, while Sun had to settle for the bronze medal.She began her 2011 outdoor season in good form, winning an Asian Grand Prix meet in 13.18 seconds, and rose to the occasion at the 2011 Asian Athletics Championships in July, where she retained her title in a personal best of 13.04 seconds.Later that month she ran under thirteen seconds for the first time, taking advantage of a 1.7 m/s wind to clock a time of 12.94 seconds in Nanching.