Inclusion Criteria:  The subject has metastatic colorectal cancer, and the first and second-line standard treatments have failed There is at least one target lesion that can be treated with HIFU Voluntarily accept this treatment clinical research, and sign the "Subject Informed Consent" 18-75 years old, no gender limit The level of physical strength of the Eastern Cooperative Oncology Group (ECOG): PS<=2 The expected survival time is greater than 3 months No chemotherapy or radiotherapy within 21 days before enrollment The function of major organs is basically normal  Exclusion Criteria:  Pregnant or lactating women People infected with HIV, hepatitis C virus and Treponema pallidum There is an active infection that requires systemic treatment (such as active tuberculosis) Severe infection within 4 weeks before starting the study treatment Subjects who have received allogeneic tissue/solid organ transplantation The patient suffers from major vascular disease or irregular bleeding disease Suffer from physiological or pathological malnutrition diseases, chronic diarrhea, cachexia, etc. The patient has autoimmune diseases, such as (but not limited to) multiple sclerosis, systemic lupus erythematosus and inflammatory bowel disease, vitiligo The patient has a history of serious drug or food allergy (for example, allergy to protein) The patient has serious heart disease (including but not limited to: myocardial infarction, cardiomyopathy, valvular disease, malignant arrhythmia, etc.), severe liver and kidney damage, uncontrolled blood sugar and blood pressure (the subject's blood pressure, After using antihypertensive drugs, it still cannot be controlled within the normal range; fasting blood glucose is still >10mmol/L after using antihypertensive drugs) The patient has uncontrollable seizures or loss of insight due to mental illness In the 12 months before screening, the patient has a history of drug abuse, drug abuse, and long-term alcoholism Within 3 months before screening, the patient is participating in other clinical studies Other situations that cannot participate in clinical research.