Michael Spavor's sentencing is the latest development in a diplomatic spat between the two countries.
A court in the Chinese city of Dandong has sentenced a Canadian citizen to 11 years on charges of spying.
Michael Spavor has been detained since 2018, after being arrested with fellow Canadian ex-diplomat Michael Kovrig.It comes as an extradition battle involving Meng Wanzhou, a senior executive at Chinese tech giant Huawei, is taking place in Canada. In a statement published on Wednesday, the Dandong court said: "For the crime of spying and illegal provision of state secrets abroad [Spavor] has been sentenced to 11 years in jail, confiscation of 50,000 yuan worth of personal property and deportation."China had separately on Tuesday rejected an appeal by a Canadian citizen who was found guilty of drug smuggling - upholding his death sentence.