NOVELTY - Use of salvianolic acid A composition is claimed in preparation of medicines for improving neural functions after cerebral ischemia, where the composition is prepared using raw components comprising 90-99 wt.% salvianolic acid A (SalA), 0.1-3 wt.% lithospermic acid, 0.1-3 wt.% rosmarinic acid, 0.1-3 wt.% salvianolic acid B and 0.1-5 wt.% salvianolic acid C.    USE - The Sal A composition is useful in preparation of medicines for improving neural functions after cerebral ischemia (claimed).    DETAILED DESCRIPTION - Use of salvianolic acid A composition is claimed in preparation of medicines for improving neural functions after cerebral ischemia, where the composition is prepared using raw components comprising 90-99 wt.% salvianolic acid A (SalA), 0.1-3 wt.% alkannic acid, 0.1-3 wt.% rosmarinic acid, 0.1-3 wt.% salvianolic acid B and 0.1-5 wt.% salvianolic acid C. The salvianolic acid A composition is prepared by (a) taking Salvia miltiorrhiza medicinal raw material, cutting S.miltiorrhiza into pieces or crushing S.miltiorrhiza into crushed product having 5 mm diameter, adding water to crushed product in an amount 3-15 times the amount of the crushed product, performing extraction at 45-95 degrees C and 10-50 revolutions per minute (rpm), adding water to obtained extract in an amount 3-15 times the amount of the extract, performing extraction for 1-3 times, where each time extraction is performed for 1-4 hours, concentrating obtained 30-60% extract until relative density reaches 1-1.25, adding ethanol to obtained concentrated product to maintaining content of ethanol at 50-85% in the concentrated product, alaloeing obtained solution to stand for sometime, filtering the solution, concentrating obtained filtrate, recovering ethanol from the filtrate, concentrating the filtrate until no ethanol remains in the filtrate to obtain S.miltiorrhiza extract, or (b) cutting or crushing S.miltiorrhiza into 5 mm crushed product, adding 30-60% ethanol to the crushed product in an amount 3-15 times the amount of the crushed product, performing reflux extraction for 1-3 times, where each time extraction is performed for 1-4 hours, concentrating obtained extract until no ethanol remains in the extract, recycling ethanol to obtain S.miltiorrhiza liquid extract, diluting the liquid extract using water, adjusting pH of diluted extract solution to 3.5-6.5 using 30 mg alkali solution, adding 0.1-3 mol.% zinc chloride as catalyst to salvianolic acid B, heating the solution at 100-140 degrees C for 1-6 hours, adjusting pH of the solution to 2.5-4.5, allowing the extract to stand for sometime, subjecting the extract to centrifugation, concentrating obtained supernatant fluid containing 1-10 mg salvianolic acid A, purifying the supernatant fluid by HPD-100 macroporous resin column chromatography, where sampling amount of the salvianolic acid A and macroporous absorption resin is 1:35:70, the ratio of diameter and height of the resin column is 1:4-1:30, eluting the column by adding water in an amount 1-8 times the volume of the column, or eluting the column by adding 10-40% ethanol in an amount 1-10 times the volume of the column, removing impurities, or eluting the column by adding 20-60% ethanol in an amount 2-10 times the volume of the column, performing HPLC detection, collecting eluted portions containing salvianolic acid A, concentrating eluate, recycling ethanol, concentrating solution containing 1-10 mg salvianolic acid A solution, performing polyamide chromatography column separation, where sampling amount of the salvianolic acid A and polyamide column ratio is 1:5-1:25, the ratio of diameter and height of the resin column is 1:4-1:25, adding water to the water in an amount 10 folds the volume of the column, adding 20-60% ethanol in an amount 5-20 times the volume of the column, eluting impurity, adding 40-90% ethanol solution in an amount 4-15 times the column volume, collecting salvianolic acid A, concentrating the solution, recycling ethanol, regulating pH of the concentrated solution to 2-4, adding water to p-tert-butyl ether in an amount 1-8 times the amount of the p-tert-butyl ether, performing extraction for 2-6 times, separating organic layer, concentrating extract, recycling ether to obtain salvianolic acid extract, adding the extract to silica gel, stirring and drying the sample, where ratio of diameter and height of the silica gel column is 1:4-1:25, using n-pentane-tert.-butyl ether as eluent, performing elution, concentrating extract, recycling eluent, recycling organic solvent and salvianolic acid A, dissolving salvianolic acid A in water by adding water in an amount 5-20 times the amount of the salvianolic acid A, and subjecting obtained solution to microwave vacuum-drying process to obtain the salvianolic acid A composition.