If there is no swelling in the lower limbs after one year of DVT and there are no other contraindications, pregnancy can be considered, but once the pregnancy is ready, oral anticoagulants must be stopped. It should also be noted that in this case, the chance of recurrence of DVT during pregnancy and puerperium is higher. In order to prevent recurrence, firstly, we must insist on wearing elastic stockings, and secondly, if the swelling of the limb is aggravated or even if it is not aggravated, but in late pregnancy, we can apply low molecular heparin subcutaneously to prevent recurrence. Once the swelling of the limb becomes obvious again, the thrombosis may have recurred, and the patient should go to the local vascular surgery department for treatment in a timely manner and analyze whether the fetus can be preserved or abortion can be induced according to the specific situation.