Zhang, as identified by police, is an associate professor of Chemistry at an unnamed but "famous" university in Hubei province's Wuhan city.
He sold at least 193 kgs of methylone drug last year after discovering a gap in the market when he went to Australia as a visiting professor, state-run Xinhua news agency quoted police as saying.
Zhang was arrested on suspicion of producing and selling methylone, a psychoactive drug commonly used as a substitute for MDMA, or ecstasy, over the internet.
Zhang's business came to light in November last year, when local customs agents checked overseas-bound parcels and found at least nine parcels from one mailer contained white powder.
The powder was found to be methylone, a psychoactive drug under heavy state restriction in China.
Commonly used as a substitute for MDMA, methylone can lead people to lose control over their behaviour and even cause death.
On June 17, customs and police raided Zhang's lab in Jiangxia District of Wuhan, arresting eight people and seizing around 20 kgs drugs.
