Generally speaking, the tumor should not exceed 3 cm in diameter and the number of tumors should not exceed 3. Of course, there are larger radiofrequency needles now. However, if the tumor is too big, it is difficult to guarantee the thoroughness of treatment. In addition to the size and number, the location of the tumor is also important. First of all, the tumor should be in a position where the needle can be inserted. If the tumor is too close to the edge or too close to the diaphragm (the diaphragm separates the thoracic and abdominal cavities), even if the needle can be inserted in these positions, the claw-like branches of the RF needle will easily damage the nearby organs (such as intestinal canal and lung) and cause some serious complications. Similarly, if the tumor is close to the gallbladder, it is also very dangerous and can easily damage the gallbladder and cause biliary peritonitis. The last rule is that the patient’s general condition such as blood clotting function, heart and lung, liver and kidney function should be good. To summarize, patients with small tumor, small number and good location are suitable for radiofrequency treatment.