TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): The fluorine-containing pyrazole compound is prepared by mixing fluorine-containing alpha -oxo ketene dithioacetal compound of formula (II) with hydrazine at a mole ratio of 1:1.25, agitating in organic solvent in presence of acid, preserving temperature of the reaction system below 80 degrees C, agitating for 5-48 hours, and preparing target product; and removing solvent, eluting residue through silica-gel column chromatography, and collecting product. A ratio of the organic solvent to hydrazine is 20 ml:0.0025 mol. A volume ratio of organic solvent to acid is 5:1.R1=perfluoro-chain 1-4C alkyl;R2=H, halo, nitro, CN, sulfonic acid, carboxyl, chloroformyl, alkyl, substituted vinyl, amino carbonyl, aryl, aroxyl, aroxycarbonyl, aryl sulfenyl, sulfonyl, arylazo, or aroxycarbonyl;R5, R6=1-6C hydrocarbyl, benzyl, or aryl;dotted line between R5 and R6=(CH2)n;andn=1-4.The carbon atom is connected with hydrogen, halogen atom, nitro, cyano, sulfonic acid, hydrocarbyl, amino, mercapto, carboxyl, alkoxycarbonyl of 1-6C hydrocarbyl, 1-6C hydrocarbyl, alkoxyl of 1-6C hydrocarbyl, alkyl sulfenyl of 1-6C hydrocarbyl, benzyl, or aryl substituent. Preferred Compounds: The compound of formula (II) is 1,1,1-trifluoro-4-thioaldolactal-3-butylene-2-ketone. The hydrazine is hydrated hydrazine, methyl hydrazine, benzene hydrazine, parachloro benzene hydrazine, or paranitro benzene hydrazine. The acid is hydrochloric acid or glacial acetic acid. The organic solvent is N,N-dimethyl formamide, ethanol, or dimethyl sulfoxide. The eluent used in the eluting step is petroleum ether or ethyl acetate. SPECIFIC COMPOUNDS - 4 compounds of (I) are specifically claimed, comprising 1-phenyl-3-trifluoromethyl-5-(3'-mercaptopropylthio) pyrazole of formula (4), 1-(4'-chlorophenyl)-3-trifluoromethyl-5-(3'-mercaptopropylthio) pyrazole, 1-(4'-nitrophenyl)-3-trifluoromethyl-5-(3'-mercaptopropylthio) pyrazole, and 1-methyl-3-trifluoromethyl-5-(3'-mercaptopropylthio) pyrazole.