TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: First catalyst is stannous octoate, isobutyl octanoate, organic carbamidine, metal zinc, tributyltin chloride, iron acetylacetonate, zinc lactate, nano zinc oxide, taurine, ethanol iron, n-propylalcoholiron, isopropyl alcohol iron or n-butanol iron. Second catalyst is mixture of pyridine, 2-methylpyrazole instigate, 4-methylpyridine or 4-dimethylaminopyridine, and triethylamine, ethylenediamine, triethylenediamine or triethylenetetramine. Third catalyst is pyridine, 2-methylpyridine, 4-methylpyridine or 4-dimethylaminopyridine. Organic solvent is dioxane, dichloromethane, acetonitrile, toluene, dimethyl sulfoxide, tetrahydrofuran and N,N-dimethylformamide. Precipitating agent is diethyl ether, n-heptane, petroleum ether, methanol and ethanol. Dehydrating condensing agent is N,N'-dicyclohexylcarbodiimide or 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): Compound (I) is prepared by:(A) polymerizing 90-99.9 mol.% lactide monomer and 0.1-10 mol.% hyperbranched polyester Boltorn H20, H30 or H40 as raw materials and first catalyst under anaerobic condition at 120-180 degrees C for 8-12 hours to obtain H-PLA dendritic copolymer;(B) adding 40-90 mol.% butanedioic anhydride or maleic anhydride, 5-30 mol.% second catalyst as raw material under organic solvent at 10-40 degrees C for 10-48 hours, precipitating with precipitating agent, filtering, drying to obtain carboxylated dendritic polymer H-PLA-COOH; and(C) adding TPGS at mol ratio of 1:20-80 and dehydrating condensing agent under third catalyst at 10-40 degrees C for 10-48 hours, filtering, precipitating with precipitating agent, filtering, and drying.Preferred Method: The method further comprises purification of H-PLA dendritic copolymer comprising dissolving H-PLA dendritic copolymer into dichloromethane, ethyl acetate or dioxane, adding methanol, diethyl ether or petroleum ether to precipitate, filtering, and vacuum drying.