It depends on experience 1 and the appearance of the nail back. The wild turtle shell has a smooth back, thin and even skin, and a waxy light sense, which can be seen in the carapace corridor. However, the back skin of domestic turtle shell is slightly thicker, and the wart grains are rough and dull, which is not easy to see the shell corridor like toad skin. 2, from the color of the nail back. Wild turtles are gray-black, khaki, brown and black spots, while domestic turtles are mostly green in black, green in yellow and green in moss. 3, from the body shape. Wild soft-shelled turtle is proud and healthy, slightly flat, and its muscles are tight because of its long-term natural state of 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 the abdominal cartilage of wild soft-shelled turtle is large, and the resilience of pressing with fingers is large. However, the abdominal cartilage of domestic soft-shelled turtle is weak, and it feels soft and weak when pressed with fingers.