Abstract: The present invention provides an image sensor module having build-in package cavity and the Method of the same. An image sensor module structure comprising a substrate with a package receiving cavity formed within an upper surface of the substrate and conductive traces within the substrate, and a package having a die with a micro lens disposed within the package receiving cavity. A dielectric layer is formed on the package and the substrate, a re-distribution conductive layer (RDL) is formed on the dielectric layer, wherein the RDL is coupled to the die and the conductive traces and the dielectric layer has an opening to expose the micro lens. A lens holder is attached on the substrate and the lens holder has a lens attached an upper portion of the lens holder. A filter is attached between the lens and the micro lens. The structure further comprises a passive device on the upper surface of the substrate within the lens holder.