In order to do the thermal balance tests for some type space-cameras and to overcome the shortcomings of traditional solar simulators in complicated structure, high costs and low light efficiencies, a simulated solar Xe flash-lamp array placed in a vacuum tank was developed. The theoretical principles of the simulated solar lamp array were analyzed, then it pointed out that its irradiance should be set to 635.2～905.4 W/m2 and its efficiency of optical system is 0.144 4. The heat conduction ability of the liquid nitrogen cooling system in the vacuum tank was analyzed, and the results indicate that the temperature of cooling system in the vacuum tank ΔT is 2.074 1 K and lower than a super cooling temperature of 4 K, which means that the liquid nitrogen cooling system can export the heat of solar simulated lamp array out from the vacuum tank. The thermal design of the simulated lamp was analyzed and discussed, results show that the temperatures of optical integrator and mirror are all around 200 ℃ , and the temperatures of cathode and negative electrodes of the lamp are around 92 ℃, which meets their normal working conditions for a long time. Finally, the technological specifications of the simulated solar lamp were tested, it is shown that its radiation intensities are 600～1 000 W/m2, and the inuniformity and unsteadiness of radiation are less than ±5％ and ±5％/h, respectively. Those data are well coincident with the design targets