Abstract: The power of single-tube blue semiconductor laser is relatively low. In order to obtain high power laser output, the multi-tube fiber coupling technology was used to achieve 10 W blue laser output, and the white light source output synthetized by laser excitation phosphor sheet was taken as the car high beam light source.According to the requirements of automotive lighting regulations, an automobile high beam lighting system was designed, the optical structures of parabolic reflecting shade, biconcave lens and phosphor sheet as well as the influence of reflecting shade curve parameters, the positions of biconcave lens and phosphor sheet on the color temperature uniformity and illuminance of light source were described in detail.A elliptical parabolic reflecting shade with an elliptical opening of 19 mm×31.6 mm at the top, a circular opening of 5 mm diameter at the bottom and with the height of 60 mm was designed.When the phosphor sheet was placed at a distance of 15 mm from the reflector bottom, an elliptical spot of 5 m×12 m was obtained on the receiving surface 25 m from the light source, the white light source had a luminous flux of 1 025 lm and a center color temperature of 5 880 K, the central color coordinates were (x=0.322 6, y=0.369 2).Results show that the high beam lighting system meets the requirements of automobile lighting regulations.