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Design studies method of star sensor thermal stability with liquid cooling using modern CAD has been described. Optimal operation of two circuits for liquid cooling structure of star sensor has been chosen using a mathematical model for calculating the convective heat transfer coefficient. Study defined the angular displacement of the star sensor with liquid cooling (~ 0.3 arc seconds), which is acceptable for star sensors with 1 arc seconds accuracy. At this level of scientific investigation the developed 3D model of the star sensor assembly comprising a thermally stabilizing ground test equipment allows to determine the angular error due to the temperature loads and optimal parameters liquid of cooling system (for example, the flow rate of fluid , geometrical parameters of cooling circuits , etc.). In the future, this model should be improved, which will consider the impact of other factors (e.g. gravity, vibration, etc.) on the performance of the star sensor.