Abstract: As a clean and efficient energy, nuclear energy can replace coal for heating in winter, so as to achieve the goal of “reducing pollution and carbon” in the heating process. According to the heat supply demand index proposed by the heat supply network, based on MATLAB/Simulink simulation platform, the whole plant main system model of swimming pool-type low-temperature reactor was established, and the heat supply control scheme which can be used for reactor power regulation was put forward in this paper. The fixed value adjustment process of reactor power and the reactor response process under heat network accident conditions were analyzed in detail. The simulation results show that the control scheme can adjust the reactor power according to the fixed value demand of the heat supply network load. During the adjustment process, the main temperature parameters of the reactor are within the safety limit, and the temperature in the user room of the heat supply network can be maintained near 18 ℃. Due to the large heat capacity of the low-temperature reactor pool and there are three heat exchange circuits from the heat source to the heat network, resulting in a certain pure lag link, which makes the regulation time constant of the water supply temperature very large. At the same time, the control scheme has a certain ability to resist small load disturbance under accident conditions. In case of small load step disturbance of 2%PN caused by accidents such as fracture of heat supply network, the scheme can control the reactor power unchanged, and the temperature in the user’s room can only change within the range of 1 ℃ and be stabilized again. In addition, the control scheme can automatically trigger the flow control link of the primary circuit under the accident condition of the heat supply network, adjust the flow of the primary circuit, so that the temperature entering the reactor water tank does not exceed 68 ℃, so as to ensure that the water temperature of the water tank does not exceed the concrete temperature limit. As the primary circuit flow decreases, the core outlet temperature rises immediately. Therefore, it is necessary to place the main pump lower from the ground, so as to increase the effective NPSH (net positive suction head) of the main pump and prevent it from cavitation. In conclusion, the heating control scheme can meet the heating load demand of the heating network, maintain the stability of reactor power under the condition of small disturbance of the heating network accident, and meet the safety requirements of temperature parameters, which have a certain design reference value.