Police suspected that something was wrong with the man after he was spotted behaving suspiciously and walking in a peculiar way, the Himalayan Times reported.
When quizzed, the Chinese admitted to concealing gold in his rectum.
Police, with the help of doctors at the Sinamangal-based KMC Hospital, removed the contraband which he had placed inside a condom with its part outside so that he could pull it out easily after reaching his destination.
The airport has reported three such cases of gold smuggling earlier.
Last week, two other Chinese nationals were arrested with eight kilograms of undeclared gold being smuggled via the airport.
Police said smugglers were changing their modus operandi for smuggling gold through Tribhuvan International Airport.
Concealing gold in the rectum, battery box, laptop, baggage, air-filter of vehicle, cargo trucks and inner sole of shoes are some ways adopted by smugglers.
Smugglers also mould gold into jewellery and wear them to outsmart security officials.
Similarly, racketeers have been using returnee Nepali migrant workers to smuggle gold. Migrant workers are paid by the racketeers from the Gulf via wire after the consignment of gold is received by the concerned person in Nepal.
According to statistics released by Nepal Police, it seized 108 kg of gold in fiscal 2018-19 compared to 72 kg in the previous fiscal.
Officials said they had not been able to completely control gold smuggling for want of hi-tech screening devices and detectors along the borders and TIA, the daily said.
Most of the smuggled gold enters Nepal through TIA and Tatopani and Rasuwagadi-Kerung border points from Tibet, China.