One kind of method was introduled for the synthesis of dichloro-acetic acid ethyl ester. Dichloroacetic acid was used as staring material, the catalysis of the catalyst on dehydration of dichloroacetic acid and ethanol to produce the ether was discussed. At the same times, The effects of different water-carrying agent such as benzene, toluene, cyclohexane and their dosage on the reaction were investigated. Taking FeCl3·6H2O as catalyst, cyclohexane as dehydrant, ethanol as reaction solvent and raw materials, dichloro-acetic acid ethyl ester was product. The best reaction condition was as follows: 12.9 g dichloroacetic acid, 20 ml dehydrated alcohol, 15 ml cyclohexane, 0.5 g ferric trichloride, reaction temperature was reflux , reaction time was 40 min. After the reaction was finished , distilling and collecting 153~156 ℃ distillation to get dichloro-acetic acid ethyl ester of a colourless liquid. The yield was 85.4% and the purity is greater than or equa 98%. After the solvent was distilled, the catalyst was reused total 240 mins. The dichloro-acetic acid ethyl ester productivities of four tests are as follows respectively: 85.4%,77.1%, 83.4%，78.3%.