Abstract: Lignan flax exist in the skin of a physiological active substance, its Solvent Extraction of a number of factors effect. This article on sub-lignan single factor affecting the Extraction Process of laboratory experiments to determine alcohol concentration of 70%, Liquid Ratio of 15：1, the extraction time 4h, optimum extraction Conditions of Extracting temperature of 50 C is a single factor, laid the foundation for further extraction of multiple factors.