Abstract: A new method to the degumming process of the flax fiber is discussed in this paper, the degumming in the same water-bath of alkali and oxygen, soaking of Leavening agent (BK-100) and mechanical loosening which use the combination of physical and chemical methods are adopted to process flax fiber. The results indicate that the optimum technological parameter of degumming in the same water-bath of alkali and oxygen are as follows: the dosage of NaOH is 3.5% and H2O2 is 4%, temperature of boiling-off is 90℃,and the time is 80min,the dosage of BK-100 is 4g/L and soaking time is 20min, the maximum impact of swelling under these condition can be obtained . After degumming , the breaking strength of fiber is up to 5.02cN/dtex,and fineness is up to 2400 Nm. Compacted with the wet spinning of flax and traditional techniques, It can improve the quality and spinning property of fibers significantly, which can lay the foundation of expanding its product application and dry spinning process.