This research mainly focus on the determination of the volatile components in different periods of Citrus aurantium L. fruit and carry out qualitative and quantitative analysis,which can help the change trend pursue of the main volatile components.The key period was chosen to detect and verfy the volatile components in different parts of C. aurantium.The volatile components in C. aurantium samples were determined by headspace solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS).The volatile components were identified by comparing standard samples,NIST database and literature,and the relative contents of each component were determined and compared by peak area normalization method.A total of 69 components were preliminarily identified in C. aurantium fruit,the D-limonene,γ-terpinene and linalool were determined by comparing the standard solution,and the total contents of D-limonene,γ-terpinene and linalool were relatively high in June 17 (8.03%) and July 1 samples (33.95%).Samples from different parts of C. aurantium on July 1 were selected for further analysis,and a total of 64 different compounds were identified,and the composition of volatile components varied greatly among different parts.Among them,34 species were identified in the root part,the main components were elemol (38.24%) and trans-α-mandarin (23.85%),and 30 species in the stem were identified.the main components are elemol (23.98%),thymol (17.29%),trans-α-mandarin (13.74%),linalool (8.92%),etc.41 kinds of leaf parts were identified,and the main components were linalool (24.51%),thymol (23.49%) and elemol (10.35%).The relative content of D-limonene and other three compounds increased in the beginning and then decreased gradually during the growing period.The stems and leaves of C. aurantium are rich in volatile components,and the relative content of monoterpenes such as linalool are relatively high.This experiment provides data and technical reference for the comprehensive utilization of volatile components and non-medicinal parts of C. aurantium.

"> Citrus aurantium L., different periods, different parts, volatile components, headspace solid phase microextraction, gas chromatography-mass spectrometry