Finger reconstruction is to replace the metacarpal bone of reconstructed hand with metal prosthesis or autogenous bone, and the radius and ulna are shortened by 5cm and 6cm respectively. The extra soft tissue flap of forearm provides good skin coverage for metacarpal bones and forms a new palm. Finger reconstruction with toe or/and toe flap. When both feet provide toes, one foot takes the second toe and the other foot takes the second or (and) third toe. When a single toe is used as a donor, the nail flap of the thumb and its adjacent second or (and) third toe are taken from the ipsilateral foot, which provides a new reconstruction method for total finger loss. Finally, the blood vessels, nerves and tendons are routinely repaired and the skin is closed. When replanting the severed finger, first of all, the severed finger should be debrided quickly and thoroughly to remove all contaminated, contusion and necrotic tissues. Debridement can be performed in two groups at the same time: one group deals with the severed finger, the other group deals with the severed finger stump, and finds out the arterial stump of the severed finger according to the anatomical position, that is, small round blood spots, such as corns, can be seen in the adipose tissue on both sides of the palm of the finger. You can also squeeze it gently on the palm of your finger and find the digital artery from a small amount of accumulated blood flowing out of the vascular cavity. In the process of extrusion, the broken ends of vascular nerve bundles protrude outward more easily than other soft tissues; You can also find the digital nerve first, and then find its dorsal artery. There is a jumping point at the stump of severed finger artery, which is generally easy to find. In laceration, the artery can be severed from a higher plane, and the incision can be extended according to the anatomical position. Clamp and pull out the severed finger stump and the artery at the severed finger site with a fine-pointed toothless forceps, and then peel off the sheath with a hemostatic forceps mosquito, and free the artery stump for 2-3 mm.. The artery in the severed finger often has contusion or spasm, which makes the lumen narrow. Therefore, firstly, inject 1-2% procaine 10-20 ml into the arterial lumen with 26 # flat-headed needle to enlarge the lumen, and then insert the needle into the vascular lumen to wash out the accumulated blood and blood clots in the vascular bed. Then slowly perfuse with 0. 1% heparin saline 10 ml, and you can see that the perfusate flows out from the dorsal vein and the contralateral artery, and the fingertips gradually become full and pale, indicating that the blood vessels are unobstructed.