A solar concentrating system is designed to solve the nonuniform illumination distribution problem of the flares through traditional concentrating systems with line focus. This concentrator system consists of curved cylindrical Fresnel lens array and a planar waveguide. A general formula of curved Fresnel with line focus and the design formula of the V-groove of the waveguide are presented. The system is in a small volume, with the total height less than 40 mm. Through orthogonal test and optical simulation, structure parameters of the system are optimized. Meanwhile, the influences of the machining error of the curved line focus Fresnel lenses and the installation error of the waveguide are discussed. It turns out that the optical efficiency of the optimized system with a lighting area of 500 mm×200 mm in the condition of 50× geometric concentration is about 75% and the illumination uniformity is above 88%. Simultaneously the optical efficiency is over 50% within ±7° declination angle of the incident light. Different concentration can be reached by splicing and it is proved by simulation that the optical efficiency is above 50% and the uniformity is more than 85% within 160× concentration.