A method for fabricating a package structure is provided, which includes the steps of: forming a first insulating layer on a carrier; forming a dielectric body on the first insulating layer, wherein the dielectric body has a first surface formed on the first insulating layer and a second surface opposite to the first surface, and a circuit layer and a plurality of conductive posts formed on the circuit layer are embedded in the dielectric body; forming a second insulating layer on the second surface of the dielectric body, wherein the glass transition temperature of the first insulating layer and/or the second insulating layer is greater than 250° C.; and removing the carrier. Since the glass transition temperature of the first or second insulating layer is greater than that of the dielectric body, the package structure has a preferred strength to avoid warping, thereby dispensing with a support member.
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