Jiang began competing at national level in 2007 and made his international debut for China at the 2008 Asian Junior Athletics Championships, where he finished fifth in the 110 m hurdles. That year he ran a personal best of 13.83 seconds at the Good Luck Beijing pre-Olympic trial event. He also ran a best of 13.50 seconds over the smaller junior hurdles while taking second place at the Chinese junior championships. He began to establish himself among his country's top hurdlers the following season and ran a personal best of 13.69 seconds to win at Zhaoqing leg of the Chinese Grand Prix. At the end of the year he represented the Jiangsu province at the 11th Chinese Games and finished in fifth place.