NOVELTY - Pyridine, trivalent aluminum ion compound, low-boiling alcohol, hesperetin and iodine are mixed, and the mixed solution is dehydrogenated. The dehydrogenated product is traced, and sealed distillation of resultant product is carried out. The distillate is added into a reactor, and heated. Sealed distillation of resultant product is carried out, demethylation reaction is carried out, and obtained demethylation product is traced. The distillate is dissolved in alcohol, phosphoric acid is added, and luteolin is precipitated.    USE - Synthesis of luteolin, luteoloside and luteolin rutinoside used in chemical and medical fields.    ADVANTAGE - The luteolin, luteoloside and luteolin rutinoside are synthesized with high demethylation rate under mild reaction conditions, by environmentally-friendly process.    DETAILED DESCRIPTION - Pyridine, trivalent aluminum ion compound, low-boiling alcohol, hesperetin and iodine are mixed, and mixed solution is hydrogenated at 20-110 degrees C. The dehydrogenated product is traced by paper chromatography/thin layer chromatography/high-performance liquid chromatography, and sealed distillation of resultant product is carried out at 80-180 degrees C for 2-80 hours. The distillate is added into a reactor, and heated to dissolve. Sealed distillation and demethylation of resultant product are carried out sequentially, and obtained demethylation product with high yield is traced and inspected by paper chromatography/thin layer chromatography/high-performance liquid chromatography. The obtained distillate is dissolved in alcohol, phosphoric acid is added, and luteolin is precipitated. Pyridine, trivalent aluminum ion compound, low-boiling alcohol, hesperetin-7-O-glucoside and iodine are mixed, and the mixed solution is dehydrogenated at 20-110 degrees C. The dehydrogenated product is traced by paper chromatography/thin layer chromatography/high-performance liquid chromatography, and sealed distillation of resultant product is carried out at 80-180 degrees C for 2-80 hours. Demethylation reaction of resultant product is carried out, and demethylation product is traced and inspected by paper chromatography/thin layer chromatography/high-performance liquid chromatography. The obtained distillate is dissolved in alcohol, phosphoric acid is added, luteolin and diosmetin-7-O-glucoside are precipitated, and luteolin and diosmetin-7-O-glucoside are separated by chromatographic separation method. Pyridine, trivalent aluminum ion compound, low-boiling alcohol, hesperidin and iodine are mixed, and mixed solution is dehydrogenated at 20-110 degrees C. The dehydrogenated product is traced by paper chromatography/thin layer chromatography/high-performance liquid chromatography, sealed distillation of resultant product is carried out at 80-180 degrees C for 2-80 hours, demethylation reaction is carried out, and obtained demethylation product is traced and inspected by paper chromatography/thin layer chromatography/high-performance liquid chromatography. The distillate is dissolved in alcohol, phosphoric acid is added, precipitated and filtered. The obtained luteolin-7-rutin acidic aqueous solution is adsorbed by macroporous resin adsorption method, washed using pure water, and eluted using ethanol. The ethanol is recovered, and luteolin-7-rutinoside is obtained. The luteolin-7-rutin acidic solution is subjected to acid hydrolysis, and obtained luteolin and luteolin mixture is subjected to silica gel column chromatography, to obtain luteolin and luteolin monomer. The luteolin-7-rutin acidic solution is completely hydrolyzed in alcohol, to obtain luteolin.