NOVELTY - Production of artemether from artemisinin comprises dissolving artemisinin in methylene dichloride, adding methanol, potassium borohydride and anhydrous calcium chloride, reacting until no crystal particle in mixed solution, reacting and collecting dichloromethane extraction solution; adding dichloromethane extraction solution with methanol and concentrated hydrochloric acid, reacting, standing and layering; adding paste with methanol, adding activated carbon, filtering; adding dropwise distilled water in filtrate, adding with methanol aqueous solution, pulping and drying.    USE - Method for producing artemether from artemisinin (claimed).    ADVANTAGE - The total yield is increased by 4%.    DETAILED DESCRIPTION - Production of artemether from artemisinin comprises:    (A) taking 10 pts. wt. methanol, cooling to - 8 to - 1 degrees C, dissolving 2 pts. wt. artemisinin in 3 pts. wt. methylene dichloride, pouring methanol, keeping temperature at - 8 to - 1 degrees C, adding 0.54 pt. wt. potassium borohydride and 0.34 pt. wt. anhydrous calcium chloride, reacting at 1-4 degrees C until no crystal particle in mixed solution, continuously adding 8 pts. wt. methylene dichloride, cooling to - 8 to - 3 degrees C, adding 2.5% hydrochloric acid solution to adjust pH to 3, reacting, adding dichloromethane, and collecting dichloromethane extraction solution;    (B) adding dichloromethane extraction solution with 1.4 pts. wt. methanol and 0.1 L 37% concentrated hydrochloric acid, reacting at 30-32 degrees C for 5 hours, adjusting pH to 6-7 using 5% sodium bicarbonate, standing and layering, taking solvent methylene dichloride layer and upper layer solution, and recycling dichloromethane extracting solution to obtain paste;    (C) adding paste with 12 pts. wt. methanol, stirring and dissolving, adding 0.2 pt. wt. activated carbon, keeping temperature at 20-40 degrees C for 20-40 minutes, filtering and collecting filtrate;    (D) adding dropwise 6.6 pts. wt. distilled water in filtrate, stirring, controlling temperature at 30 degrees C, after finishing dripping cooling 5 degrees C, and performing centrifugation to obtain the crude product; and    (E) adding crude product with 20 pts. wt. methanol aqueous solution at mass ratio of 3:6, carrying out pulping twice, carrying out centrifugation, and drying.