The police in Jinggu Dai and Yi Autonomous County, Pu'er City, received information in mid-May that drug dealers planned to traffick drugs from overseas into central China's Hunan Province via Yunnan.
Police apprehended two suspects in a hotel on May 24, and found 16 blocks of heroin and 23 bags of methamphetamines, weighing 36 kg in total from a truck parked at a garage in Lancang Lahu Autonomous County, Jinggu police said.
In the second operation on June 16, they found 45.8 kg of methamphetamine in a rented apartment in the same county. Four more suspects were seized.
The six suspects have been detained and further investigation is under way.
Drug trafficking is a challenging problem in Yunnan, as it borders the Golden Triangle known for drug production and trafficking.