Patent ID: 8247253

Claim:
A method for fabricating MEMS package structure, comprising: providing a substrate; forming a plurality of lower metallic layers and a plurality of first oxide layers, the lower metallic layers and the first oxide layers interlaced with each other to compose a MEMS structure and an interconnecting structure; forming an upper metallic layer above the MEMS structure and the interconnecting structure, the upper metallic layer having at least a first opening and at least a second opening, the first opening located above the interconnecting structure, the second opening located above the MEMS structure, area of the first opening being greater than that of the second opening; employing the first opening and the second opening as etching channels to remove a portion of the first oxide layers so as to form a first cavity surrounding the MEMS structure and form a second cavity above the interconnecting structure, the first cavity communicating with the second cavity; sealing the second opening in a vacuum environment; and forming a packaging element above the upper metallic layer in a non-vacuum environment to seal the first opening.