A method of fabricating an INFO package may include at least the following steps. A first buffer pattern and a second buffer pattern are formed on a substrate. A first chip is attached on the substrate through the first buffer pattern. A second chip is attached on the substrate through the second buffer pattern. A squeezing force is provided between an exterior surface of the substrate and a top surface of the first chip and between an exterior surface of the substrate and a top surface of the second chip. The squeezed first buffer pattern and the squeezed second buffer pattern are cured. A molding compound is formed surrounding the first chip, the second chip, the squeezed first buffer pattern and the squeezed second buffer pattern. A redistribution circuit structure layer is formed electrically connected to the first chip and the second chip on the molding compound.