A package of an environmental sensitive element including a flexible substrate, an environmental sensitive element, a flexible sacrificial layer and a packaging structure is provided. The environmental sensitive element is disposed on the flexible substrate. The flexible sacrificial layer is disposed on the environmental sensitive element, wherein the environmental sensitive element includes a plurality of first thin films and the flexible sacrificial layer includes a plurality of second thin films. The bonding strength between two adjacent second thin films is substantially equal to or lower than the bonding strength between two adjacent first thin films. Further, the packaging structure covers the environmental sensitive element and the flexible sacrificial layer.