As is known to all.the current sharing circuit of paralleled DC-DC power supply system is vital to the realization of high-power redundant power supply.There are two major categories in the traditional current sharing technology, including the Droop method (output impedance method, slope method) and active-flow method.Its reported that there inevitably occur the problems, such as big current sharing errors (up to 5%).high cost, circuit complexity, reliability and low stability in the traditional current sharing technology, which are based on small-signal model analysis.Compared with this.the current sharing method based on the theory of the chaotic synchronization can not only address these problems, but achieve good current sharing performances.