An ink-jet microchip interface between the continuous liquid flow and flame-ionization detector (FID) for gas chromatography (GC) has been developed. An ink-jet microchip for a conventional recorder was modified for the interface. When the interface was used for a flow-injection analysis (FIA) system with FID, 3.3 ng of the detection limit (S/N = 3) of ethanol in water was performed.