In this study, the far-infrared radiation characteristics of three materials and the effects of different metals on far-infrared radiation were explored. The study used the point-shaped far-infrared emission source as a research object to examine the different influencing factors and power density distribution regulation of the point-shaped far-infrared source. Results indicated that the far-infrared sintered material exhibited the highest power density, followed by the ceramic and glass materials. Factors that affected the power density of far-infrared materials were identified as the quality, irradiated area, and metal cover. The power density of the point-shaped far-infrared source increased with temperature, and the wavelength corresponding to the maximum power density was approximately λ=6-10 μm. The power density of the point-shaped far-infrared emission source was distributed in a radial manner. In the range of the vertical distance L=0-3 cm and radius r=0-1 cm, the far-infrared power density attenuation rate was low and was designed accordingly. In addition, a mathematical model of power density E and normal distance L was established. Based on these factors, we designed a far-infrared emitter combination model with a uniform field energy. Results revealed that the field energy of this model was evenly distributed to achieve the desired effect.