Ethyl 4-bromo-4,4-dinitrobutyrate was synthesized by Michael addition reaction of bromodinitromethane potassium salt and ethyl acrylate, and the effects of the ratio of raw materials, reaction temperature and time on the reaction were studied. The optimum synthetic technology conditions with 52% yield are: molar ratio 2:1 of ethyl acrylate to bromodinitromethane potassium salt, reaction temperature 30 ℃, reaction time 30 min, TBAB as phase transfer catalyst. The quality of TATB is equivalent to 25% of bromodinitromethane potassium salt. The structure of the product ethyl 4-bromo-4, 4-dinitrobutanoate was identified by IR, NMR, UV-Vis, MS and elementl analysis.