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For the weak points of citrus Huanglongbing (HLB) heat treatment by hot air, such as high energy consumption, slow heat transfer, and heavy heating equipment, far infrared heat treatment method for citrus HLB was put forward. An experimental platform of HLB far infrared heat treatment was set up, which consisted of heat treatment enclosure, far infrared lamp groups, a paperless recorder, a 12 channels temperature recorder and some temperature sensors, to study the influence of the far infrared lamp groups quantity, the power of far infrared lamp, the heating time, position of the far infrared lamps on the temperature field distribution of far infrared heat treatment. The results showed that the quantity of far infrared lamp groups, the power of single far infrared lamp and the heating time had significant effect on the temperature field distribution of leaves and branches, the distance between the far infrared lamp groups and the top of the stent had significant effect on the temperature field distribution of leaves. The factors that affecting the temperature field distribution were optimized. The optimum parameters were as follows: the quantity of far infrared lamp groups was 3, the power of single far infrared lamp was 1kW, the heating time was 3min, and the distance between far infrared light and the top of the bracket was 10cm. Under the optimal parameters, the average temperature of leaves was 58.1℃, the average temperature of branches was 43.1℃, and the average temperature of the whole treatment enclosure was 52.3℃. Under the parameters the effectiveness of infrared heat treatment on the control of citrus HLB was proved by experiments, the average reduction rate of bacteria concentration after treatment was 34.4%. The results provided a reference for the optimization design of largescale HLB infrared heat treatment equipment.