Trionyx sinensis, also known as Trionyx sinensis and Trionyx sinensis in Taihu Lake, belongs to Trionyx sinensis of Tortoise suborder. It was once widely distributed in the lower reaches of the Yangtze River, Taihu Lake and northern Vietnam, living in rivers and lakes and feeding on aquatic animals, with an average life span of 300 years. It is a national first-class protected animal in China. Only three species are known in the world, namely 1 from Suzhou Zoo, 1 from Tongmo Lake in Vietnam and 1 from Xuanhan Lake in Vietnam. They are the most endangered species among turtles, and they are likely to become extinct in the future.

The carapace is oval, the length of the dorsal disc is 36-57 cm, and the weight can reach 100 kg. The body is flat, only slightly raised, the back is smooth and shiny, dark olive green or dark green, with many yellow spots. A large number of yellow spots are scattered between the larger macula. The back of the head, neck and limbs is dark green with irregular yellow spots. This dense yellow stripe is the characteristic of the tortoise, and these characteristics are more obvious in the front of both sides. Larval crustaceans are angular and have many small nodules, which gradually disappear with age.

They usually live in slow or still water related to major rivers and can stay underwater for a long time. Adults are omnivorous, fierce and have strong territorial behavior. For a long time in history, soft-shelled turtle was mistaken for "giant salamander", which is a kind of giant salamander. Turtles are officially recognized as effective new species.