Abstract: A wire-bonding free packaging structure for light emitting diode (LED) is provided. Prepare a silicon sub-mount having a backside bulk micromachining reach-through U-shape cavity for accommodating a flip-chip LED. This stack-integrated packaging module with solder bumps on the surface is than bonded to an aluminum PC board with flip-chip surface mount packaging or bump technology. This gives very good heat conduction to the heat sink of the PC board and can endure more current to enhance light intensity of the LED. This stack-integrated packaging module can also be bonded on a lead frame with two leg packaging, which can also increase heat conduction.