1, judging from the appearance of the nail back. Wild tortoise shells have smooth back, thin and uniform skin, and a sense of wax light, which can be seen in the carapace corridor. However, the back skin of domestic turtle shell is slightly thick, and the wart particles are rough and dull, so it is not easy to see the toad skin-like shell gallery.

2, from the color of the back of the nail. Wild turtles are gray-black, khaki, brown and black spots, while domestic turtles are mostly cyan-black, green-yellow and moss-green.

3, from the body shape. Wild soft-shelled turtle is proud and healthy, slightly flat, and its muscles are tense due to the long-term hard foraging. However, the domestic turtle is swollen, thick and clumsy, and its muscles are soft.

4, press the abdominal nail. The elastic strength of abdominal cartilage of wild soft-shelled turtle is high, and the resilience of finger pressing is high. However, the abdominal cartilage of domestic soft-shelled turtle is weak, and it feels soft and weak when pressed with fingers.