The thermal conductivity coefficient is defined as: per unit length, per K, how much energy can be transmitted in W, the unit is W/mK. Among them, “W” refers to the unit of thermal power, “m” represents the unit of length, meter, and “K” is the unit of absolute temperature. The larger the value, the better the thermal conductivity. Copper-based PCB is a unique metal-based copper clad laminate copper-based PCB, which has good thermal conductivity, electrical insulation performance, and mechanical processing performance. The thermal conductivity of copper-based PCB can be measured by testing instruments after the laminate is pressed.