Due to the development of the public Construction (Mass Rapid Transit ,MRT/ Taiwan High Speed Rail ,THSR) in recent years, the problems of public safety are gaining more and more important. Especially for fire hazard issue, which might not only causes the fire direct property loss but also threaten the safety of human beings and pollute the environment. Cables are the main combustible matter in the NPP (Nuclear Power Plant), whose combustion characteristics are the most important parameters for fire hazard assessment. The examination of the program is based on the data from the cone calorimeter experiment. There are five kinds of cable in the experiment, the materials of jacket and insulation contain PVC, EPR, XLPE, PE, etc. This experiment measures the heat release rate, the consumption of oxygen and concentration of CO, CO2 and O2. In addition, the ignition time, the combustion duration time and the extinguish time are recorded. The FDS (Fire Dynamics Simulator) was used for the simulation in this thesis. The low-voltage cable that jacket contained PVC would be analyzed and compared to the experimental data. Unfortunately, FDS can not be used for the simulation of combustion of the cable ashes. From the result of simulation, the trend of heat release rate, the consumption of oxygen and the concentration of CO, CO2 and O2 are similar to the experimental data.