Inclusion Criteria:  Patients with primary liver cancer clinically diagnosed preoperatively (tumor ≥3cm to ≤10cm, diagnostic criteria: Primary liver cancer Diagnosis and Treatment Code 2019 edition); No tumor thrombi formation and distant metastasis were found in the imaging data; Child-Pugh grading standard of liver function was GRADE A or B; 18-66 years old; Complete clinical case data; all patients underwent surgical treatment; Voluntarily participate in the study and sign the informed consent.  Exclusion Criteria:  There are basic diseases that cannot tolerate surgery (such as severe cardiopulmonary cerebral renal insufficiency); Preoperative imaging examination found cancer thrombus in main portal vein and branches, common hepatic vein and branches, main hepatic vein and branches and inferior vena cava; planned pregnancy, unplanned pregnancy and pregnancy; Preoperative child-Pugh grading standard of liver function was Grade C. Disease researchers that the investigator considers inappropriate to participate in this clinical trial.