Chen, 18, tested positive for hydrochlorothiazide, a diuretic, on the August 7 test, the Xinhua news agency reported, citing the Chinese Swimming Association (CSA).
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The CSA said Chen has asked the International Olympic Committee for a hearing, as well as a test of her B-sample.
Before the results came back positive Xinyi was scheduled to compete Friday in the 50m freestyle.
It also reiterates its resolute disapproval of banned substances. The Court of Arbitration for Sports (CAS) has already confirmed that she will be suspended for the remainder of competition at the Rio Olympics.
But alongside the storm that has engulfed Russian Federation over accusations of “state-sponsored” in two World Anti-Doping Agency investigations, China has also been accused by some rivals.
China’s National Anti-Doping Agency provided no comment so far.
In March, the CSA revealed that six Chinese swimmers had tested positive for drugs in the preceding months, including three for hydrochlorothiazide.
She finished fourth Sunday in the 100-meter butterfly and pulled out before Friday’s 50-meter freestyle, her final event of the games.
Friday’s episode carries particular poignancy following the uproar caused by swimmer Mack Horton’s labeling of his Chinese competitor Sun Yang as a “drug cheat”. Two of the six athletes were disciplined with only warnings. One of those swimmers is Yulia Efimova – target of US swimmer Lilly King’s infamous finger-wag.
United States superstar Michael Phelps has demanded life bans for swimmers with a drug record.
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And in recent years, some former sport doctors of Chinese competitive teams have told Australian media of state-sponsored doping among Chinese athletes, reaffirming the suspicion of many critics.
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Efimova was allowed to compete at the Games only after winning an appeal against a ban for a previous doping offence.
