A package structure and a formation method of a package structure are provided. The method includes placing a semiconductor die over a redistribution structure and placing a conductive feature over the redistribution structure. The conductive feature has a support element and a solder element. The solder element extends along surfaces of the support element. The method also includes stacking an interposer substrate over the redistribution structure. The interposer substrate extends across the semiconductor die. The method further includes forming a protective layer to surround the conductive feature and the semiconductor die.