The four were convicted of murder, drug trafficking, kidnapping and hijacking, the official Xinhua news agency quoted the court in Kunming, the capital of Yunnan province, as saying.
The three accomplices sentenced to death were a Thai citizen, a Lao citizen and one stateless person, according to earlier reports.
Two other members of Nor Kham's gang, both Myanmar citizens, were each given a suspended death sentence and eight years in prison for their involvement in the same crimes, the agency said.
It said all six defendants told the court they planned to appeal their sentences.//DPA