The present invention relates to a bast fibers refined by the refining method and the method of the bast fibers, more specifically, by using an ultrasonic, cellulose during as well as impurities, which potential in the shell of the bast plant strain and the mold (Cellulose ) lyase of cellular cyclase (α-1 of using a screen process, a pure pectin lyase (pectin lyase) enzyme that kills fungi that secrete Cellulase) and also remove the foreign substances contained in the bast fibers, pectin (pectin) , by dissolving in water to break down cellulose cut a ring of four combination pectin connecting it rose widen the free space between the fibers which result in enzyme degradation processes to expand the exposed surface area of ​​the fibers and the first refining process, EDTA (Ethylene-Diamine- Tetraacetic Acid) and by using an ultrasonic, completely removing the first protocol pectin and pectin, which is decomposed US remaining in refining process, and then a low concentration By yirueojim including a second polishing step of using sodium and ultrasonic oxide removed by a physical, chemical to hemi cellulose and lignin, unlike the conventional steel refining method using a chemical processing method, and the microorganism strain used only alkaline chemicals, , relates to a bast fibers refined by refining method and the method of the bast fibers to make, yet environmentally friendly as well as yet uniformly reduce the refining time and amount of water to obtain a high-quality bast fibers.