This paper reported a micro ion source array for flexible concurrent fabrication of micro devices.In this study, to simplify and facilitate to integrate the ion sources with high density, ionic liquid (IL) 1-ethyl-3-methl imidazolium tetrafluoroborate ([EMIM]-[BF 4 ]) was applied to the source material of ions. A reservoir for this IL was integrated to the micro emitter array using silicon micromachining.As experimental results, emitting of the ion from the [EMIM]- [BF 4 ] and volatilization of silicon fluoride when exposing the silicon wafer to the emitted ion could be confirmed.