Titan arum (Amorphophallus titanum) is a rareendangered plant in the world. It has a
huge flowerreleases a repulsive odor like a corpse. On the evening of 23 July 2022 (Beijing time), a titan arum in the north garden of the China National Botanical Garden in Beijing bloomed.determine the componentscontents of volatile compounds released by the titan arum during its flowering, the dynamic headspace adsorption method was utilized to collect the odor of the titan arum flower on the evening of 23 July (S1), the morning of 24 July (S2), the afternoon of 24 July (S3)the evening of 24 July （S4). The volatile compounds were analyzed by automatic thermal desorption–gas chromatography/mass spectrometry. Sixty-three volatile compounds were detected in the titan arum flower in four periods. The comparison of the total volatile compounds released in four periods was S2 > S3 > S1 > S4. The highest content of volatile compounds in the S1 period were sulfur compounds dimethyl disulfidedimethyl trisulfide),the sulfur compounds were released in large amounts only in the S1 period. Dimethyl disulfide was the volatile substance with the highest content in the S1 period (20.00%). The total volatile compounds content of titan arum flower in the S2 period was the highest among the four periods. From the S2 period, the relative content of sulfur compounds decreased significantly until the S4 period. Compared with the S1 period, 1-butanolbutyl acrylate increased significantly1-butanol became the highest relative component of volatile compounds in the S2 period. After the S3 period, the total amount of volatile compounds began to declinereached the lowest level in the S4 period. It is worth noting that the contents of two terpenes,  -pinene-terpinene, rose from the S1 period until their height in the S3 period. From the S4 period, the contents of most volatile compounds decreased significantly. This study revealed the varietiescontents of volatile compounds in the titan arum flower at different flowering periods. The changing trendphysiological significance of dimethyl oligosulfide from the evening of flowering (S1) to the second day (S2–S4) were emphatically discussed,this research
also provides a reference for the study of the release of volatile compoundsthe molecular biology of the flower fragrance of titan arum.