Beijing police arrested six suspects, including singer Li Daimo, who were taking drugs at Li's temporary home in Sanlitun, Chaoyang District.
Police detained two other suspects at a hotel in Fengtai District.
Urine samples of the eight suspects all tested positive for amphetamines. They admitted their illegal drug use, state-run Xinhua news agency reported.
Li, 25, comes from China's northeastern Heilongjiang Province. He was in the first season of "The Voice of China", a singing competition that Zhejiang Satellite TV aired in July 2012.
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The company apologised to Li's fans as well as the general public on his behalf.
Li's fall from grace is just another in China's show biz that has been marred by a host of drug-taking scandals in recent years.
In April 2011, Hong Kong actor Max Mok was arrested in Beijing for taking drugs, only three months after the arrest of Chinese rock singer Xie Tianxiao on similar charges.
The following year, Chinese actor Zhang Mo, son of famous actor Zhang Guoli, was found using drugs in his village.