Abstract： Objective To investigate the incidence, risk factors, management and prognosis of hypersensitivity reaction (HSR) of platinum-based chemotherapy in patients of ovarian cancer and cervical cancer. Methods Cases from Peking Union Medical College Hospital from Jan. 2013 to Jan. 2016 were checked for patients′ data of epithelial ovarian cancer treated with carboplatin/paclitaxel (every 3 weeks) and patients of cervical cancer treated with concurrent radiochemotherapy using cisplatin (every week). General characters, pathological features, treatment and prognosis of patients were analyzed to determine the severity, symptoms, outcomes and risk factors of HSR. Results (1)Prevalence of HSR: there were 860&nbsp;cases of ovarian cancer and 580 cases of cervical cancer, among which HSR occurred in 8.8%(76/860) and 5.9%(34/580) patients, respectively.(2)Grading for HSR:most HSR were grade 1 or 2, with 78.9%(60/76) in ovarian cancer and 82.4%(28/34) in cervical cancer patients. In ovarian cancer patients, there were 7 cases of grade 1 HSR and 53 cases of grade 2 HSR, and in cervical cancer patients, there were 11 cases of grade 1 HSR and 17 cases of grade 2 HSR.(3)Symptoms of HSR:most of HSR happened during intravenous infusion of platinum agents, with 98.7%(75/76) in ovarian cancer and 97.1%(33/34) in cervical cancer patients. In ovarian and cervical cancer patients, most common symptom were tight chest and dyspnea, which happened in 92.1%(70/76) and 97.1%(33/34) patients, respectively. Secondary common symptom were skin reactions, which happened in 53.9% (41/76) and 88.2% (30/34) patients respectively.(4)Treatment after HSR: of 76 ovarian cancer cases with HSR, there were no significant difference in the ratio of HSR recurrence among patients of different treatment after HSR (χ2=0.517, P=0.915):1 of 4 patients applying prior chemotherapy, 4 of 13 cases receiving desensitization, 3 of 11 cases separating medicine, 2 of 11 patients switching to cisplatin. In 34 cervical cancer cases of HSR, there were also no significant difference in the ratio of HSR recurrence among patients of different treatment after HSR (χ2=0.079, P=1.000): 2 of 9 patients applying prior chemotherapy, 3 of 17 cases receiving desensitization.(5)Risk factors of HSR and patients prognosis:in ovarian cancer patients of HSR, risk factors included relapse (P=0.010), courses of chemotherapy reaching seven or nine for patients of primary treatment or reaching six or seven for recurrent patients (all P<0.05). There were no significant risk factors for cervical cancer patients of HSR (all P>0.05). HSR had no impact on the progression- free survival for ovarian cancer (P=0.144) or cervical cancer (P=0.782). Conclusions In ovarian cancer patients treated with carboplatin and cervical cancer patients treated with concurrent radiochemotherapy using cisplatin, most HSR of platinum are mild and favorable outcomes. Relapse and longer chemotherapy courses are risk factors for HSR of carboplatin for epithelial ovarian cancer.