OBJECTIVE To stu dy the effects of different processing me thods on the contents of the pharmacodynamic index components in Citrus aurantium and their antioxidant activity. METHODS According to the general principles of 2020 edition of Chinese Pharmacopoeia （volume Ⅳ） and the relevant processing methods in 2015 edition of Processing Specifications of Traditional Chinese Medicine in Zhejiang Province ，the samples of C. aurantium were prepared by steaming with water ，boiling with water ，stir-frying with vinegar ，stir-frying with wine ，stir-frying with bran ，processing with bran and processing with honey. The contents of moisture and ash in different products of C. aurantium were detected. The contents of naringin and neohesperidin in different products of C. aurantium were determined by high performance liquid chromatography. The antioxidant activity of different products was investigated by DPPH and ABTS + radical scavenging experiments and the total reducing power test. RESULTS The contents of moisture ，ash，naringin and neohesperidin were in line with the relevant requirements in 2015 edition of Processing Specifications of Traditional Chinese Medicine in Zhejiang Province . The content of naringin in descending order was as follow ： unprocessed sample ＞sample processed with honey ＞sample processed with bran ＞sample boiled with water ＞sample stir-fried with vinegar＞sample stir-fried with wine ＞sample stir-fried with bran ＞sample steamed with water. The content of neohesperidin in descending order was as follow ：unprocessed sample ＞sample boiled with water ＞sample processed with bran ＞sample processed with honey ＞sample stir-fried with vinegar ＞sample steamed with water ＞sample stir-fried with wine ＞sample stir-fried with bran. The samples after boiling with water ，processing with bran ，and stir-fried with bran had better DPPH radicals scavenging ability （IC50 were 7.49，8.37 and 10.22 mg/mL，respectively）. The samples after boiling with water ，steaming with water ，and processed with bran had better ABTS + radicals scavenging ability （IC50 were 1.76，2.03 and 2.72 mg/mL，respectively）. In addition ， compared with sample stir-fried with wine and processed with 发。E-mail：wanglu1286@163.com honey，unprocessed sample and other processed products of C.aurantium had bet ter total reducing ability. CONCLUSIONS After processing ，the contents of the main pharmacodynamic index components in C. aurantium have been reduced ，but they were also in line with the relevant requirements in 2015 edition of Processing Specifications of Traditional Chinese Medicine in Zhejiang Province . The antioxidant ability of some processed products has been enhanced.