If the ultrasound of the upper abdomen indicates multiple low-density shadows in the liver, the possibility of liver metastases is relatively high. At this time, the patient should do further correlation examination, for the metastatic tumor of the liver, mostly seen in the patient’s rectum, as well as the colon part of the tumor disease may be. At this time, it is necessary to check colonoscopy to see whether there are polypoid lesions or ulcerative lesions in the rectum and colon, and do biopsy if necessary to see whether there is any possibility of tumor disease. For the liver, patients need to check the enhanced CT of the upper abdomen and do MRI if necessary, and do liver puncture biopsy if necessary, to confirm whether the patient has the possibility of tumor metastasis by pathology. If metastatic tumor is considered, if it is a single lesion, combined with colorectal neoplastic disease, colorectal surgery can be performed at the same time, the resection of liver mass surgery, or radiofrequency ablation surgery. In the case of multiple masses, patients are advised to actively consider systemic intravenous chemotherapy or hepatic interventional perfusion chemotherapy.