Abstract: For the miniaturization and portability demands of solar simulator, a portable solar simulator was designed. Illumination in 1.2 m1.2 m rectangular irradiated area not less than 0.02 solar constant was required; furthermore, the un-uniformity of irradiated surface less than 5% was also needed. The system mainly consisted of short-arc xenon lamp, ellipsoidal reflector, fiber optic beams, and a group of collimating lens. Through software simulation and experimental verification, the results met all the requirements. Experimental results show that the method that designing a portable solar simulator with short-arc xenon lamp, ellipsoidal reflector, fiber optic beams, integral stick, and projection collimator lens group is effective and feasible.