Yide futures is Chang's base camp. Yide Futures Co., Ltd. was established in July 1995, and its chairman is Chang. Its history and personnel team originated from the former Tianjin United Futures Exchange. In 2007, Yide Futures received capital injection from Tianjin Financial Investment Management Center and its headquarters moved to Tianjin, which will gradually develop into a national futures company with complete main business licenses and the highest business qualification in the futures industry. The chairman is Chang, so Yide Futures is Chang's base camp.