1. Clinical evaluation of multimodal ablation system for pancreatic cancer with hepatic metastatic malignancies.
2. Construction of a combined treatment system of multimodal ablation therapy combined with immunotherapy and chemotherapy.
3. Transformation and clinical application of multimodal ablation system for pancreatic cancer with hepatic metastatic malignancies.

Inclusion Criteria:

1. age 18-70 years old, gender is not limited;
2. Newly diagnosed pancreatic cancer with liver metastasis confirmed by pathology or consistent with clinical diagnosis, and no metastases to organs other than the liver;
3. Imaging evaluable tumors with safe access to puncture;
4. The number of half liver tumors ≤3 and the size of each tumor ≤3 cm;
5. ECOG PS score ≤2 points, expected survival > 3 months.

Exclusion Criteria:

1. Liver function Child-Pugh grade C, severe jaundice, especially obstructive jaundice;
2. The liver is significantly atrophy, the tumor is too large, and the ablation range needs to reach one-third of the liver volume;
3. Expected survival < 3 months;
4. serious heart, lung, liver and kidney dysfunction and coagulation dysfunction;
5. Uncontrolled co-morbidities, including poorly controlled hypertension or diabetes, persistent active infections, or mental illness or social conditions that may affect participants' compliance with the study;
6. refractory ascites, pleural fluid or bad fluid;
7. Pregnancy or breastfeeding;
8. The researcher considers that there are any other factors that are not suitable for inclusion or affect the participant's participation in the study.