Hand injury causes more common are the following: 1, stab wounds: such as nails, needles, bamboo tips, pieces of wood, small pieces of glass and other stab wounds. Characterized by small import, deep injury, can injure the deep tissue, and can bring dirt into the deep tissue, resulting in foreign body retention and tendon sheath or deep tissue infection. Beijing 306 Hospital Emergency Department Fu Qiang 2, sharp injuries: knives, glass, cans and other cutting injuries in daily life, labor injuries caused by paper cutters, chainsaws, etc. Wounds are generally neater, lighter contamination, more bleeding wounds, wounds of varying depths, resulting in different degrees of tissue damage, often resulting in important deep tissues such as nerves, tendons, vascular severance injuries, serious cases can lead to finger end defects, broken fingers or limbs The serious cases can lead to finger end defects, broken fingers or limbs. 3, blunt force trauma: blunt force trauma caused by tissue contusion. Generally can cause skin lacerations in severe cases can lead to skin avulsion tendon nerve damage and fractures. Smashing of heavy objects can cause serious destruction of various tissues of the fingers or the whole hand; high-speed rotating blades, such as turbines, electric fans, etc., often resulting in broken limbs and broken fingers 4, extrusion injuries: door and window extrusion can only cause finger-end injuries, such as subxiphoid hematoma, nail bed rupture, distal phalanges fractures. Wheel, machine roller extrusion, can cause extensive skin avulsion or even the whole hand skin off set injury, multiple open fractures and joint dislocation, as well as serious damage to deep tissue, some fingers and the whole hand destructive injury requires amputation (finger) 5, firearm injuries: such as firecrackers, detonator explosion injuries and high-speed shrapnel injuries. Especially explosive injuries, the wound is extremely uneven, extensive damage, often resulting in large areas of skin and soft tissue defects and multiple fragmentation fractures. This injury is heavily contaminated with necrotic tissue is very susceptible to infection.