This study aims to investigate the effect and influence of liposome bupivacaine anterior serrat plane block on postoperative chronic pain in breast cancer patients, evaluate the therapeutic effect of liposome bupivacaine in postoperative chronic pain, and provide a new method for patients with postoperative chronic pain.

Inclusion Criteria:

• Adult patients (aged ≥18 years) who are scheduled to undergo unilateral modified radical breast cancer surgery

Exclusion Criteria:

• 1. Patients with coagulation dysfunction 2. There are infected patients at the puncture site 3. For patients allergic to any trial drug 4. Patients who take painkillers within 48 hours before surgery 5. Severe cardiopulmonary insufficiency, such as EF< 40%, FEVC < 50% expected; Uncontrolled hypertension; 6. Refuse to perform nerve block puncture 7. Mental disorders, epilepsy history; 8. Unable to give informed consent or are participating in other clinical trials.