The main causes of metal foreign body residue in soft tissue: (1) improper safety precautions: most of them are building and construction workers, and metal fragments such as steel, iron filings, wire, nails and aluminum products are common, while female sewers are common with broken metal needles. (2) firearm injuries, mainly due to gunshot or hunting (lead bullets, iron sand bullets) gunshot injuries. (3) explosion injuries, such as those caused by the explosion of gas cans. Presentation: Patients presenting with symptoms of local pain, numbness, local lumps or long-lasting wound infection; locally asymptomatic, those with anxiety due to excessive concern about foreign body residue, and some asymptomatic patients account for. Indications: Some scholars believe that if a metallic foreign body is not symptomatic in the soft tissue and does not pose a potential threat to the surrounding organs, the foreign body can be allowed to remain. It is also advocated to operate after 3 months, when the foreign body is wrapped and fixed by the formation of fibrous scar tissue around the foreign body, the operation is more likely to be successful; however, we believe that in the absence of special circumstances, it is not beneficial to wait. Interventional treatment methods: 1, for superficial foreign body first positive and lateral fluoroscopy to determine the nearest skin point from the foreign body after local anesthesia cut an incision of about 5-8mm, mosquito forceps or curved forceps to separate the subcutaneous tissue to the foreign body and as far as possible to the tip of the pliers touch and clamping to remove; foreign body such as round foreign body such as metal bullets, can also be removed with mosquito forceps or round concave foreign body clamps; irregular-shaped foreign body such as iron pieces and other difficult to directly When the foreign body can be lifted outward after clamping the foreign body with pliers and then carefully peel off the foreign surrounding tissue under the direct vision of the knife tip and remove. 2.For superficial and deep foreign bodies that cannot be removed directly, the cannula method is used to remove them. 3.For the round foreign body close to the nerve in the separation and clamping that there are obvious symptoms of nerve pulling, then use the outer casing to cover the foreign body after the ring separation to large syringe aspiration. Advantages: real-time positioning, accurate, less traumatic, simple, safe and reliable, small vascular damage, high success rate (>90%).