The present application relates to a polymer composite capable of being quickly dissolved or dispersed in an aqueous solvent, and a preparation method and an application thereof. The polymer composite includes a polymer capable of being thermodynamically dissolved in water or an aqueous solvent and a dispersant containing an ion capable of coordinating with the polymer. The polymer is selected from the group of a water soluble homopolymer and/or copolymer, in particular, thermogelable amphiphilic copolymer.

Disclosed are a method of preparing a biodegradable resin composition, a biodegradable resin composition prepared by the method and a biodegradable molded article. More particularly, the method includes surface-treating an inorganic filler with a surface treatment agent; and mixing the surface-treated inorganic filler with a biodegradable resin, wherein the surface treatment agent comprises a fluidity enhancer, wherein the fluidity enhancer comprises a phthalic acid ester-based compound.