In this report, temperature and gas generation of pulverized coal during pyrolysis under nitrogen atmospheric condition has been measured to understand heat and mass transfer before its combustion. A furnace was heated at 400 K/h until a setting temperature, TS. After that, the temperature at a wall of the furnace was kept at TS for 0.5 h. For TS = 873K, the gas flow rate had a 1^<st> peak at t = 50 min. A temperature in the packed bed, Tpc, was about 400 K at the time. So, the 1^<st> peak was caused by evaporation of water. As time elapsed, the gas flow rate became increasing at t = 65 min. The Tpc was about 490 K. For t > 65 min, the gas flow rate had a 2^<nd> peak at Tpc = 650 K with exothermic reaction, which was caused by polymerization. At TS = 1073 K, it was found that not only heat transfer but also gas generation due to the exothermic polymerization became more obvious than those at TS = 873K.