NOVELTY - An environment-friendly five-step method of preparing cyclopropyl fibrate (Ciprofibrate) involves using para-hydroxybenzaldehyde as raw material, decarboxylating, protecting hydroxyl group, forming ring, deprotecting, and conducting Bargellini preparation method for forming cyclopropyl fibrate.    USE - As environment-friendly method of preparing cyclopropyl fibrate (Ciprofibrate) (claimed) used as hypolipidemic agent for reducing level of low density lipoprotein, and increasing level of high density lipoprotein.    ADVANTAGE - The method has simple operation, has mild reaction condition and is easy to control, has convenient processing, is environment-friendly, provides product in high yield, avoids use of peracid or hydrogen peroxide, has higher safety, effectively uses cheap para-hydroxybenzaldehyde as raw material and is suitable for industrial-scale synthesis of the product.    DETAILED DESCRIPTION - An environment-friendly method of preparing cyclopropyl fibrate (Ciprofibrate) of formula (I) involves using para-hydroxybenzaldehyde as raw material, decarboxylating, protecting hydroxyl group, forming ring, deprotecting, and conducting Bargellini preparation method for forming cyclopropyl fibrate. The method involves decarboxylation of para-hydroxybenzaldehyde (II) with malonic acid for 8-12 hours in organic solvent to form para-hydroxystyrene (III), where the mol ratio of the raw material (II) and malonic acid is 1:1.5-3; protecting hydroxyl group by reacting 4-hydroxy-styrene (III) in a solvent, adding alkali and hydroxyl protecting group in certain proportion, reaction for 5-8 hours at 10-50 degrees C to form 4-benzyloxy-styrene (IV); forming ring by reacting 4-benzyloxy-styrene (IV) in organic solvent, adding aqueous solution of alkali, adding phase transfer catalyst and chloroform, reacting at low reaction temperature of 25-70 degrees C, completely reacting, using organic solvent to extract, combining the organic layer, adding sodium sulfate, filtering, evaporating the solvent to form 1-benzyloxy-4-cyclopropyl-phenyl (V); de-protecting by reacting (V) in organic solvent at 20-50 degrees C, adding reducing agent as catalyst, conducting hydrogenation reaction at low pressure of 0.1-3 MPa for 8 to 10 hours, filtering and concentrating to form 4-(2,2-dichloro-cyclopropyl)-phenol (VI); and conducting Bargellini reaction at low temperature of 0-10 degrees C by adding alkali to compound (VI), mixing acetone in liquid, stirring and adding chloroform, raising the temperature to 60-80 degrees C until the reaction is finished, adding water to wash for 2 times, combining the water layer, using hydrochloric acid in l-2 mol/l to adjust the pH value, using organic solvent to extract, combining the organic layer, condensing and extracting with organic solvent to form cyclopropyl fibrate.