A three-parallel-arm, placebo-controlled randomized pilot study will be adopted. One hundred and fourteen breast cancer patients scheduled to receive the first cycle of chemotherapy will be recruited from three provincial hospitals in Fuzhou, China, and will be randomly assigned to one of the three groups: the true AT group, the sham AT group or the standard care group. Participants in the true AT group will receive standard anti-emetic medications plus a 5-day auricular acupressure at the specific ear acupoints, participants in the sham AT group will receive standard anti-emetic medications plus a 5-day auricular acupressure at the same acupoints as in the true AT group without any acupoint stimulation, while participants in the standard care group will only be provided with the standard anti-emetic medications. The feasibility outcomes will be the recruitment rate and consent rate during the recruitment stage, the attrition rate during the whole study period, feasibility of the study questionnaires and auricular acupressure protocol to the study participants, and AT-related adverse events. The future main study outcomes will also be measured including acuteCINV, delayed CINV, anticipatory CINV, and quality of life. After completing the pilot clinical trial, a nested qualitative interview will be conducted to explore participants' experience in completing the trial and receiving the intervention.