The Chinese city, which staged an ITU World Cup competition in May,  is due to hold the event on May 9 and 10.

It will be exclusively for countries which have not secured places for two men and two men at the Olympic Games after the last mixed relay series event in Abu Dhabi in March.

The mixed triathlon relay will make its Olympic debut at the Games in the Japanese capital.

Six of the eight venues to host a World Triathlon Series in 2019 - Abu Dhabi, Leeds, Bermuda, Yokohama, Hamburg and Edmonton - will do so again next year.

The Grand Final is due to take place in Edmonton in August, following the conclusion of the Olympic Games, while the ITU revealed another race "is in the process of being added".

The dates and location of the seventh regular season event are set to be announced after the 2019 ITU Congress in Lausanne.

Abu Dhabi is set to stage the opening World Triathlon Series competition on March 6 and 7, featuring sprints and a mixed relay.

The circuit is then scheduled to head to Bermuda for a regular event on April 18 to 19 before the mixed relay qualifier is held in Chengdu the following month.

Yokohama is scheduled to host the third series race on May 16 and 17, followed by the competition in Leeds in Britain on June 6 and 7.

Hamburg in Germany is due to play host to the final leg on July 11 and 12, with the Grand Final in Edmonton taking place on August 21 to 23.

"The World Triathlon Series is the pinnacle of elite triathlon racing," said ITU President Marisol Casado. 

"The WTS has been paramount in bringing international attention to triathlon by holding races in iconic locations that are broadcast to a global audience. 

"And in 2020 we will be once more delivering top tier events around the world to give our top elite athletes the opportunity to shine and earn really valuable points in the race to the Olympics."