An package structure includes a substrate, a pair of electrodes and a solder pad layer both electrically connected to each other and respectively disposed on two opposite surfaces of the substrate, a lighting diode arranged above the substrate and electrically connected to the pair of electrodes, a wall disposed on the substrate and arranged around the lighting diode, and a package compound disposed inside of the wall and covering the lighting diode. The package compound includes an attaching portion disposed on a top surface of the lighting diode, and a surrounding portion arranged around the attaching portion. The surrounding portion has an annular slot arranged on a top surface thereof. A bottom end of the annular slot is located at a position aligning with 25%˜90% of a thickness of the lighting diode along a height direction.