In this study, the target product 2-fluorocyclopropane carboxylic acid has been prepared from allyl alcohol in five steps. First, allyl alcohol was protected by benzyl group, then after cyclization, benzyl group was removed, followed by debromination and oxidation, the title compound has been synthesized with overall yield of 35.3%.The characterization methods of 1HNMR and MS were applied to confirm the structures of the intermediates and the final product. Comparing to the reaction conditions of each step, optimal conditions were that: In the cyclization reaction, n(allybenzyl ether) : n(dibromofluoromethane) = 1:1.2 and benzyl triethylammonium chloride was used as phase transfer catalyst; zinc powder was used as reducing agent at 70℃; the best solvent of oxidation was a mixed solvent of acetone and water (volume ratio 4:1).