Abstract: During preparing nanopowders production by wire electrical explosion, the powder size was directly influenced by phase states of explosion products. For study the effects of process parameters on phase states of the explosion products, a series of experiments were conducted with variations of initial charging voltages and electrode gaps in a segmented wire explosion setup. The results show that, when the electrode gaps was constant, the liquid proportion in explosion products could decrease to the minimum only at some certain charging voltage, while it would increase at the other charging voltages. Increasing electrode gap decreased the mininum of liquid proportion, and made correspondent initial charging voltage increase.