ARJ21-700 AC104 of Commercial Aircraft Corporation of China, Ltd. (COMAC) returned to China safely on April 28th, 2014 after completing natural icing flight test successfully in North America. This is the first time for the first turbofan regional jet independently developed by China to fly abroad and carry out flight test in special weather conditions, and meanwhile, ARJ21-700 aircraft has achieved a global flight of 30,000 km across Asia, America, Europe, Pacific Ocean and Atlantic Ocean. The success of ARJ21-700 natural icing flight test has verified the flight safety of the aircraft in icing conditions, cleared another obstacle troubling airworthiness certification, and provided an access for China’s civil aircraft to carry out flight test abroad.