The formation of liquid droplets, which were generated at the confluence of two‐microchannels, was nvestigated in the microchip. Tributyl phosphate (TBP)‐droplets were formed precisely and continuously at 90–200 &mgr;m‐diameter at the range of 5–55 mm/s in the main‐channel and 47–370 mm/s in the other‐channel and a variation in the formation of TBP‐droplet was observed in a microchannel. And, the extraction of Aluminum‐DHAB chelate (DHAB=2,2′‐dihydroxyazobenzen) was studied by the laser‐induced fluorescence. The fluorescence intensity of Al3+‐DHAB chelate in the droplet was gradually increased with the distance from the confluence of two‐channel. The extraction using droplet in the microchannel has finished for 18 second. © 2004 American Institute of Physics