In this paper, the effect of the inclination angle of LED chips on the light extraction is investigated with the simulation software of Trace Pro. The square LED chip models with the side length of 300 μm are build and their inclination angle is set as 0o, 15o, 30o, and 45o. The light extraction efficiency simulations suggest the light extraction efficiency of the LED chips can be enhanced by changing the inclination angle. With the increasing inclination angle from 0 to 45 degree, the light extraction efficiency increases at first, then decreases. When inclination angle is 30o, the light extraction efficiency maximizes at the value of 20.6%, which is increased by 13.2% approximately in comparison to the vertical LED chips.