The present invention relates to a method for preparing an organic micro-bubble composite particle, wherein the method comprises a step of sonicating an aqueous solution including a graphene-based compound and an amphiphilic material in the presence of an gas, or wherein the method comprises a step of injecting an aqueous solution including a graphene-based compound and an amphiphilic material and a gas into a micro channel; an organic micro-bubble composite particle comprising a core part including at least one gas selected from the group consisting of inert gases and carbon dioxides, and a shell layer including a graphene-based compound and an amphiphilic material; and an ultrasound contrast agent comprising the organic micro-bubble composite particle.;COPYRIGHT KIPO 2015
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