Jiang gave up his last official title in 2004 but remained a force behind the scenes in the wrangling that led to the rise of current President Xi, who took power in 2012.
Jiang Zemin died of leukaemia and multiple organ failure in Shanghai, where he was a former mayor and Communist Party secretary
Jiang died from leukemia and multiple organ failure in Shanghai at 12:13 p.m., the official Xinhua news agency said.
Two retired senior Chinese officials are engaged in a battle with one another to sway Beijing's new leadership over the future of the one-child policy, exposing divisions that have impeded progress in a crucial area of reform.