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选用30 m×0.53 mm(i.d.) HP PLOT/Al_2O_3石英毛细管柱,程序升温和分流进样技术对液化石油气的18种C_1 ～C_5烃类组分进行分离.选择水浴加阀箱气化方式,并以80 ℃为气化温度优化了进样口温度等色谱参数.液化石油气各组分在一定浓度范围内其浓度与响应值有良好的线性关系,相关系数r为0.994 0 ～0.998 8.各组分实际样品的检出限为0.001% ～0.002%(摩尔分数).“,”18 C_1 -C_5 carbohydrate composition in liquefied petroleum gas(LPG) was separated by 30 m × 0. 53 mm(i. d. ) HP PLOT/Al_2O_3 capillary column with temperature programming and split injection. The vaporizing processes with waterbath and valve system was used, and 80 ℃ was selec-ting as the vaporizing temperature of LPG. The chromatographic parameters such as injection inlet temperature of GC were optimized. Under the optimal conditions, the calibration curves showed good linearity for the certain concentration of LPG compositions with correlation coefficients in the range of 0. 994 0 -0. 998 8. The detection limit of the LPG compositions was between 0. 001% and 0. 002% ( molar fraction).