The most important characteristic of liver cancer is that it is easy to recur. Under the premise of active postoperative monitoring, early detection of recurrence foci and early treatment are extremely crucial. For the review points, please refer to the review points after liver cancer surgery, because after liver cancer recurrence, the recurrent foci are rarely on the surface of liver, so the risk and difficulty of re-operation are significantly increased. However, liver cancer must be dealt with, and ablation by inserting a needle into the liver through the skin is the best way.