The biggest risk of lower limb DVT is that the thrombus is dislodged to form pulmonary tethering, and large pulmonary embolism can lead to sudden respiratory arrest, cardiogenic shock and death. Therefore, the main care of lower limb DVT is to pay attention to the patient’s breathing with continuous oxygenation and cardiac monitoring to prevent thrombus dislodgement. Absolute bed rest is required, and it is forbidden to go down to the ground, and the patient’s respiratory condition is closely observed. After the treatment of deep vein thrombosis, such as catheter thrombolysis, inferior vena cava filter implantation, and suction thrombolysis, it is also very important for the care of the puncture site, and the patient should be forbidden to go to the ground, so that the puncture site can be observed for bleeding and hematoma and other complications. Catheter thrombolysis should be disinfected and changed regularly to prevent the occurrence of catheter-related infections. It is also important to monitor the coagulation function of the patient to see if subcutaneous bleeding, gum bleeding, nasal arguments, etc. occur when the patient uses thrombolytic drugs and anticoagulants.