In the satellite laboratories, sun simulator is one of the most important equipment in order to test satellite sun sensors. The behaviour of sun sensors is strongly influenced by the angle of sunshine. Therefore, increasing the accuracy in the testing mechanism of these elements is essential for their overall monitoring of their performance before launching to space. Sun simulator includes electronics and control units, structures, motion mechanisms, heat control, optics and light sources. In the design of the motion mechanism and the structure of this simulator, the considerations of the instruments such as the material of the structure, the type of joints, the structural components, motion mechanism of the projector, the static and dynamic loads applied to the structure and the thermal considerations caused by the projector heaters are very important. The purpose of this study is to design and analyse the loading, dynamical and thermal properties of the solar system simulator with precision positioning. Therefore, at the first, plans are proposed and the proper design is selected and preliminary design and partial design are done. Finally, after selecting the components of the system, various analyses and the correct operation of the device will be approved in order to evaluate the system's resistance to static and dynamic loads as well as vibrational and thermal loads.