In order to raise the accuracy of light distribution test of automotive lamp and cut the cost about test system

a new-style system for light distribution test of automotive lamp was reserched

which could test luminance of every poit on light screen

and used two servo motors to control shaft with screw thread

based on moving in two-dimentional plane. After comparing to accuracy of the curent rotating desk system with the best precision in China

the best test distance of automotive signal light luminous intensity to two kinds of test systems was analyzed.Through director test and angle transformation of headlamp

the coordinate error of test points was caculated according to national standard

as well as luminance with standard lumeter. Experimental results indicate that the position precision of the system is 0.1 mm with an increase of 42 times over the curent rotating desk system

and luminance accuracy is 0.02lx tripled that of ones. Experiment to automotive signal light shows that the best test distance about the rotating desk system is found instead of 3.16m currently in China

and the luminance accuracy of new-style system is direct proportion to test distance. It can satisfy the system requirements of national standard with higher precision and rapid speed

the adjustable lamp tested distance as well as easy control.