An experimental study on the enhanced boiling heat transfer outside a tube with weak electric conduction fluid was conducted by inserting a electric field in the fluid. Relationships among high electric field voltage，heat flux，heat transfer coefficient and enhancement factor were obtained. The efficiency of EHD (electrohydrodynamics) enhancement for R11 and the different proportion mixture of R11 with R134a was analyzed. Analysis of consumption of the supplied electric field was carried out. The results have laid a foundation for exploring mechanism of EHD enhancement of boiling heat transfer and its practical application in engineering.