The present invention relates to a biodegradable nanocomplex. The biodegradable nanocomplex comprises a first electrically charged substance, a charge-redistribution substance, a second electrically charged substance and a carried substance, for holding the carried substance inside. The first electrically charged substance and the carried substance have the same electrical polarity, and the biodegradable nanocomplex has a nonuniformally and positively charge distribution along a radial direction thereof. The nonuniformally and positively charge distribution comprises a first electrically charged portion having substantially electrical neutrality, a second electrically charged portion surrounding the first electrically charged portion, and a third electrically charged portion surrounding the second electrically charged portion, in which the third electrically charged portion comprises an outermost surface of the biodegradable nanocomplex, thereby modulating the carried substance towards the desired immune responses via the nonuniformally and positively charge distribution.
