Patients who meet the enrollment criteria will be randomly assigned to the WeChat education group and the regular group. In addition to the regular preoperative visits, the WeChat education group will also watch science videos through WeChat before the surgical procedures. The regular group only received regular preoperative visits and education by ward nurses. The main observation indicator is the incidence of preoperative anxiety defined as the scores of State Anxiety Inventory more than 40 points.

Patients who meet the inclusion criteria will be randomly assigned to the WeChat online education group or the regular group. Two researchers will conduct preoperative education, preoperative evaluation and postoperative follow-up respectively.The patients in WeChat group will be first assessed by a researcher on admission about anxiety and sleep (base on the State-Trait Anxiety Inventory (STAI) scale and the sleep quality scale (SQS)). Once the assessment completed, the patients are required to follow the WeChat public platform to watch the education videos when they are free. The content of the videos is jointly decided by the breast surgeon, anesthetists, and ward nurse including the overall prognosis, surgical approach, postoperative rehabilitation exercises, preparation for anesthesia, anesthesia approach and possible effects of anesthesia, which covers all aspects of surgery, anesthesia, and perioperative care. The videos are presented in an easy-to-understand pattern to ensure participants of all ages and levels of education comfortably understand the content. Participants can simply click on the video dialogue box in the public platform for playback and watch it unconditionally.Patients in regular group will be also assessed by the same researcher on admission for anxiety and sleep (base on State-Trait Anxiety Inventory (STAI) scale; sleep quality scale (SQS) scale). Upon completion of the assessment, they received oral instruction from the ward nurse covering the same contents as above instead of the education video.

Inclusion Criteria:

• female patients scheduled for elective breast cancer resection;
• aged 18 to 80 years,;
• American Society of Anesthesiologists (ASA) physical status I-III.

Exclusion Criteria:

• patients diagnosed with primary breast cancer combined with malignant tumors of other organs (such as lung, kidney, intestine, etc.);
• patients with tumor recurrence after reoperation;
• patients failing to cooperate with the study for any reason, such as communication disorders.

The participants, the anesthesiologist, data collectors, the physicians performing the follow-up, and data analysts will be blinded to the group allocation. Blinding will maintain until the completion of the final analyses.