NOVELTY - Amorphous atorvastatin calcium is prepared by reacting 5-methyl-2-phenyl-1-(4-fluorophenyl)-3-(phenylamine carbamoyl)-1,4-hexanedione with 2-(2-aminoethyl)-1,3-dioxolane in presence of protonic acid catalyst; reacting intermediate with 1,3-bis (trialkoxysilyloxy)-1-alkyl-1,3-butadiene in an aprotic solvent in presence of Lewis acid catalyst at - 60 to - 20 degrees C; subjecting reaction product to asymmetric hydrogenation; reacting obtained intermediate with (R)-(+)- alpha -methyl benzylamine; and performing alkaline hydrolysis reaction with soluble calcium salt to obtain atorvastatin calcium.    USE - Method of preparing amorphous atorvastatin calcium (claimed).    ADVANTAGE - The method has short synthesis route, simple operation and mild reaction condition, utilizes raw material having wide source, and is suitable for industrialization.    DETAILED DESCRIPTION - Preparation of amorphous atorvastatin calcium comprises:    (A) reacting 5-methyl-2-phenyl-1-(4-fluorophenyl)-3-(phenylamine carbamoyl)-1,4-hexanedione with 2-(2-aminoethyl)-1,3-dioxolane in presence of protonic acid catalyst (formic acid, acetic acid, propionic acid, butyric acid or neopentanoic acid) in methyl tert-butyl ether, tetrahydrofuran or dioxane solvent to obtain intermediate (I);    (B) adding intermediate (I) with hydrochloric acid to obtain intermediate (II);    (C) reacting intermediate (II) with 1,3-bis (trialkoxysilyloxy)-1-alkyl-1,3-butadiene in an aprotic solvent in presence of Lewis acid catalyst at - 60 to - 20 degrees C to obtain intermediate (III);    (D) subjecting intermediate (III) to asymmetric hydrogenation to obtain intermediate (IV);    (E) refluxing intermediate (IV) in toluene to obtain intermediate (V);    (F) reacting intermediate (V) with (R)-(+)- alpha -methyl benzylamine to obtain intermediate (VI); and    (G) subjecting intermediate (VI) to alkaline hydrolysis reaction with soluble calcium salt to obtain atorvastatin calcium.    The Lewis acid is titanium tetrachloride, aluminum trichloride, strontium chloride, zinc chloride, boron trifluoride or antimony pentafluoride.