Abstract: In view of the shortcomings of the current gas-nitrogen heat sink temperature control system in the space environment simulation equipment, such as the slow temperature rising and falling rate, the poor heat sink temperature uniformity and the large operation energy consumption, a new type regenerative gas-nitrogen temperature control system is developed, as a closed loop system. With the system, the heat sink temperature uniformity is improved, the temperature rise and fall rate is increased by increasing the circulating nitrogen pressure, and the cost of the system is low. This paper studies the temperature uniformity and the heating rate of the heat sink under the pressures of 0.1 MPa, 0.3 MPa and 0.5 MPa of the circulating nitrogen, as well as the liquid nitrogen consumption in three different nitrogen processes in the cooling stage and the constant temperature stage. The results show that increasing the circulating nitrogen pressure can improve the heat sink temperature uniformity and increase the temperature rise and fall rate. However, after the circulating nitrogen pressure exceeds 0.3 MPa, the temperature uniformity does not change substantially, and the pressure loss of the heat sink will increase. The consumption of the liquid nitrogen can be reduced in both the cooling stage and the constant temperature stage.