A semiconductor package structure includes a semiconductor substrate, a conductive pad on the semiconductor substrate, and a passivation layer on the semiconductor substrate and the conductive pad. The passivation layer exposes a portion of the top surface of the conductive pad. The semiconductor package structure also includes a conductive adhesive layer on the conductive pad, and a dielectric layer on the passivation layer and the conductive adhesive layer. The dielectric layer exposes a portion of the conductive adhesive layer. The semiconductor package structure also includes a redistribution layer (RDL) structure on the dielectric layer and electrically connected to the conductive pad through the conductive adhesive layer. The semiconductor package structure also includes a bump structure over the RDL structure.