Abstract: In order to improve the charging efficiency of lead-acid battery, shorten the charging time, a quick charger of the lead-acid battery for electric vehicles is designed to multistage current-adjusting mode on the basis of fast pulse charge theory and dynamic circuit model. Main circuit topology of phase full-bridge soft switch is applied to the charger. It has high efficiency, low voltage and amplifier stress and good reliability. Experimental results show pluse charge technology has shorter charging time, higher charging efficiency and lower temperature increasing during the charging process, comparing with constant current-constant voltage charging mode. As a result, pluse charge for lead-acid battery make the battery polarization reduce efficiently. Theory and experiment verify the method of fast pulse charge.