Another Panda Post opened at the Chengdu Research Base of Giant Panda Breeding on Wednesday.
The Chengdu Post Office launched its first Panda Post in 2013.
Images of the giant panda are ubiquitous, appearing on stamps, postcards and souvenirs.
A mailbox in the shape of a panda greets visitors.
More panda post offices are to be launched in the city's scenic areas.
Wednesday marks the 50th World Post Day.