Considering the properties of its asymmetric large- area illustration, a vector design approaching for LED cyclorama light is proposed to achieve the asymmetric uniform illumination on backdrop. The total distribution light curve is calculated on the basis of the required energy distribution of the target surface and the reflective surface is designed to follow the reflectivity of distribution light curve. Specifically, the coordinates of points on the reflecting surface are calculated by combining photometrics, geometrical optics, the edge- ray principle and the Runge-Kutta method in Matlab. Besides, an illustration simulation is performed in Zemax after modeling the reflective surface in Solidworks. The simulated results indicate that the illumination uniformity meets the design requirements as well as the energy efficiency is able to reach more than 80% , which show that the design is of great relevance to applications.