Abstract: Components and content of the volatile substances in slow-release attractant and normal attractant for Semanotus bifasciatus were compared after using 0, 10 and 30 days in the forest through SPME-GC-MS. 31 components were identified, among which there are 21 terpenes in the volatile substances of the two attractant. The relative percentage content of terpenes in the volatile substances of slow-release attractant were 88.87%,84.79% and 82.53% after using 0 day, 10 days and 30 days, respectively. The decreasing rates of relative percentage content in the volatile substances of slow-release attractant were 4.6% and 2.7% during 0 to 10 days and 10 to 30 days, respectively. The relative percentage content of terpenes in the volatile substances of normal attractant were 79.03%,50.74 and 49.35% after using 0 day, 10 days and 30 days, respectively. The decreasing rates of relative percentage content in the volatile substances of normal attractant were 35.8% and 2.7% during 0 to 10 days and 10 to 30 days, respectively. The relative percentage content of terpenes in the volatile substances of normal attractant was signinfcantly decreased during 10 to 30 days, while it in the volatile substances of slow-release attractant remained higher than 80%. Therefore, the slow-release attractants can achieve long-term sustained release.