Finger severance is a basic skill for hand microsurgeons. Theoretically speaking, the severed finger can be connected well, but the finger needs to be connected well with a few prerequisites: 1, the severed finger must preserve the biological activity, such as the severed finger can not be frozen for too long, and can not be too high a temperature, the temperature should be moderate; 2, the severed finger in the preservation of the process should be kept dry, can not be in contact with liquids or disinfectant liquids for too long, so as not to cause the severed finger of the loss of biological activity; 3, the preservation of time The preservation time should not be too long, the biological activity of the severed finger is lost after the preservation time is too long; 4, in the process of preservation should not be exposed to hazardous substances, leading to vasospasm of the material, similar to gasoline, lead, etc., which will easily lead to the severed end of the endothelial rupture, and lead to the finger can not support the success of reimplantation.