The capillary electrophoretic system with UV/CL or FL/ CL dual detector was developed, taking advantage of the batch-type CL detection cell and the CL reaction of luminol-hydrogen peroxide or the flow-type CL detection cell and the CL reaction of peroxyoxalate-hydrogen peroxide. In each system, the UV or FL detection was carried out with on-capillary, followed by the CL detection with end-capillary. These systems could offer easily, rapidly, and simultaneously informations due to absorption and CL as well as those of FL and CL, respectively.