A multifunctional microanalysis system platform for separating biological specimen, low-voltage electrophoretic separation, and reaction analysis to biological specimen is composed of liknear-array microelectrode chip and chip control system. Said linear-array microelectrode chip is composed of a gold electrode group on an insulating substrate. Said electrodes are covered by fluid microchannels made of insulating material. Said control chip system consists of microcontrol chip, display, keyboard, power supply and relay circuit.