Abstract Experimental investigation was performed for electrostatic spray of several spray liquids under capillaryannular electrode configuration. The effects of the material properties of the spray liquids and electrode voltage on electrostatic spraying were analyzed through the working parameters of chargemassratio(CMR). Experiments show that in the case of microflow rate ranges, there is almost a linear growth of the applied voltage and the CMR before Rayleigh limit within the right voltage range. Spray liquid electrical conductivity has a great influence on the chargemassratio，the higher the spray liquid electrical conductivity is, the faster the CMR of drops with the electrode voltage increases, and when it is lower, the applied voltage plays a leading role on the CMR. The CMR response is inversely proportional to spray liquid viscosity but proportional to spray liquid surface tension.
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