Objective To explore the effect of sensory information support on negative emotions of primiparas before cesarean section. Methods Using cluster randomization, 100 primiparous women from 4 obstetric wards requiring cesarean section were divided into a control group and an intervention group, each of 50. Both groups received routine preoperative education for cesarean delivery, while the intervention group was additionally provided with sensory information support one day before the surgery. Results Forty-six cases in both groups completed the study. After the intervention, the levels of fear, preoperative anxiety, and information needs in the intervention group were significantly lower than baseline, and also lower than the control group (all P<0.05). Conclusion Sensory information support can reduce fear and anxiety before cesarean section, and meet the information needs of primiparas.