Abstract: Capillary gas chromatography coupled with pulsed flame photometric detector (GC/PFPD) was used for the qualitative and quantitative analyses of sulfur compounds in five diesels. The result show that the sulfur compounds present in straight run diesel (156.5℃~272.5℃) are mainly alkyl-substituted benzothiophenes (BTs)，and the dominant sulfur compounds are C_3~4BTs, alkyl-substituted dibenzothiophenes (DBTs) in straight run diesel (204.0℃~363.0℃). Alkyl-substituted BTs and DBT are abundance and no other sulfur compounds were identified in the FCC diesel and hydrofining diesel. Sulfurcontaining compounds in coking diesel including almost all types of sulfides in middle distillate fractions.