Snakes are divided into two categories: venomous snakes and non-venomous snakes. If people are bitten by venomous snakes in outdoor forest work, they can not only cause skin redness, swelling and bleeding, but also death by shock. The most common venomous snakes are cobras, golden-ringed snakes, silver-ringed snakes and sea snakes. Snake bite venom is injected into the body. Performance symptoms: After being bitten by a venomous snake, the wound has a pair of venomous teeth bite marks, which can be clinically classified as neurotoxic; manifesting as convulsions and respiratory paralysis, itching and numbness of the skin; circulatory toxicity; manifesting bleeding, cardiac arrhythmia, circulatory failure; the skin can show bleeding, edema, local necrosis, ulceration and bruising. Prevention and treatment: Strengthen personal protection during outdoor activities, especially in areas where venomous snakes are found. Once bitten by a venomous snake, ligature, flush the local wound and other measures as soon as possible to prevent the spread and absorption of venom. If there is shock, respiratory, circulatory, renal and hepatic injury failure should be promptly treated as first aid. At the same time, take oral and external snake medicine, and inject antivenom and other drugs if available.