TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The alkali is sodium carbonate or sodium bicarbonate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The isolating of the glycine ethyl ester hydrochloride is to add the glycine ethyl ester hydrochloride into the diethyl ether, and ventilating ammonia at - 5 to - 9 degrees C or by adding glycine ethyl ester hydrochloride into anhydrous diethyl ether, ice cooling to - 5 to - 7 degrees C, ventilating ammonia, filtering, and concentrating the filtrate. The dosage ratio of the glycine ethyl ester hydrochloride to diethyl ether to ammonia is 1mol: 900-1300ml:1.5-1.8mol. The dosage ratio of the glycine ethyl ester hydrochloride to anhydrous diethyl ether to ammonia is 1mol:1100mol: 1.6mol. The ratio of sodium bicarbonate to 4-chloro-3-hydroxy-butanoate is 1:0.5- 1:0.8-1.3 or 1:0.8:1. The dosage of the anhydrous ethanol is 4-6 (preferably 5) times of the bicarbonate. The oxiracetam crude product is prepared by adding the glycine ethyl ester hydrochloride into anhydrous diethyl ether, ice cooling to - 5 to - 6 degrees C, ventilating ammonia, filtering, concentrating the filtrate to obtain glycine ethyl ester, adding anhydrous ethanol and sodium bicarbonate, adding 4-chloro-3-hydroxy-butanoate for 1.5-2 hours, controlling the pH value to 8-9, reacting at 70-75 degrees C for 15-25 hours, filtering, washing the filtrate by using methanol or ethanol, concentrating, dissolving the concentrate into water, extracting by adding 4 times chloroform by weight of filtrate, taking column chromatography, adding concentrated ammonia, and reacting for 3-6 hours at 20-25 degrees C. The added dosage of the 23% ammonia is 10-15 times of the column chromatography product. The purifying treatment of the crude product comprises dissolving the product into water, exchanging resin by using strongly acidic cation and collecting, exchanging resin by using strongly basic anion and collecting solution, regulating the pH value of the solution to neutral, and recrystallizing the product obtained by neutralizing and concentrating the solution. The recrystallizing treatment uses ethanol for first and then mixed solvent methanol acetone for second recrystallization. The water solution includes ratio of 1g of crude product to 0.05ml of water. The dosage of strongly acidic cation exchange resin is lg-10ml. The crude product after concentrated to the ethanol is 1g to 1 ml. The dosage for second recrystallization is first time recrystallizing crude product to methanol of 1g to 1.5ml. The volume ratio of the methanol to acetone in the mixed solution of the methanol acetone is 1:4. Preferred Component: The alcohol solvent is anhydrous methanol or anhydrous ethanol. The 4-halo-3-hydroxy-butanoic acid ethyl ester is 4-chloro-3- hydroxybutanoate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The strongly acidic cation exchange resin is number 732 strongly acidic cation exchange resin. The strongly basic anion exchange resin is number 711 strongly basic anion exchange resin.