To get a new type of automotive light source with high efficiency, better heat dissipation and small volume, LED source filled with cooling, low-viscosity, non-corrosive, electrical insulating and transparent liquid was studied especially on its optical properties. According to GB25991-2010 regulation, high-power white LED of 1300 lumens was chosen as the light source, and ellipsoidal glass shell was chosen as its basic lamp shell. By adjusting position of light source and modifying the shape of glass shell, optical designing program Tracepro was used in designing one projection-type LED automotive source. The results shows that, at the present stage when 40~50 mm diameter glass shells are introduced, illumination distribution of this liquid lens can meet the requirement of GB25991-2010 regulation for high-beam. Energy collection efficiency can reach 86.5%. The illumination intensity of experimental testing is matched with this simulation results.