The policeman named Shao Weimin, whose official title is temporary police communication officer, arrived in Rio two months ago to prepare for his role, the Beijing News reported.
"My main job is to strengthen communication with Rio police so that we can better protect the safety of Chinese sports delegates, tourists, journalists as well as all Chinese citizens in Rio," the state-run China News Service quoted him as saying.
The report came after Chinese hurdler Shi Dongpeng told state media that his personal computer was stolen on arrival in Brazil, posting security camera images of the alleged thief on his verified social media account.
Chinese Olympic-goers have been victims of frequent theft in Brazil, China's foreign ministry said last week in a warning to its citizens abroad to take greater safety precautions.
The warning received widespread coverage in China, which hosted impressive Games at a massive cost eight years ago, generating much national pride.