In order to meet the requirements of driving safety and energy-saving of lighting in tunnel, a fuzzy control method is adopted to design the tunnel lighting control system. A fuzzy control model for the tunnel lighting control system is established with tunnel exterior environment luminance, traffic volume and vehicle speed information as inputs and tunnel interior light luminance as output. Membership functions of environmental parameters and fuzzy control rules are designed based on ''Specifications for the Design of Ventilation and Lighting of Highway Tunnels (China)'' and experts' relevant experiences. The tunnel exterior environment luminance fit-curve and the tunnel interior luminance fitcurve are constructed by experimental data with the fuzzy control model on sunny days. Errors between theoretical luminance data and simulation luminance data with the fuzzy control model are less than 5 %. Comparison between luminance data from fit-curves and luminance data from original curves (no light-tuning or class light-tuning) shows that the fuzzy control system has a notable energy-saving effect (saving more than 50 % energy to no light-tuning and more than 20 % to four-steps light-tuning), and nice adaptability.