Abstract: In order to quantify the solid contents in liquid extracts and concentrated solutions in paper-making reconstituted tobacco, experiments were conducted to investigate and optimize extraction solvent, extraction time and pretreatment method. The results were analyzed by gas chromatography to determine the contents of total solids, soluble solids and insoluble solids. The samples of ten liquid extracts and ten concentrated solutions of paper-making reconstituted tobacco were analyzed by the established method, and the results were compared with those obtained by an oven method. The results showed that:1) The standard recoveries of total solids ranged from 91.17% to 97.07%, the intra-and inter-day relative standard deviations were 0.47%-1.33% and 1.52%-1.66% (n=6), respectively. The standard recoveries of soluble solids ranged from 90.58% to 97.93%, the intra-and inter-day relative standard deviations were 0.89%-1.67% and 1.25%-2.14% (n=6), respectively. 2) The relative standard deviations between the contents of total solids and soluble solids determined by the GC method and the oven method were 5.19%-10.61% and 5.63%-10.43%, respectively. The established method is simple, rapid, accurate, and suitable for the determination of contents of total solids, soluble solids and insoluble solids in samples with different solid contents.