The characteristics of manganese dioxide(MnO2) layer for the solid electrolyte of tantalum condenser formed in accordance with its pyrolysis temperature by a dry-radiational pyrolysis instead of a traditional wet-convectional pyrolysis of manganese nitrate was studied. As a result of TG/DSC analysis, manganese nitrate was started to be pyrolyzed at the temperature range from 180 to 230 ℃ through dehydration process and was transformed into MnO2 single phase at the temperature range from 230 to 250 ℃. Tantalum pellets were pyrolyzed at intervals of 20 ℃ from 200 to 300 ℃ in a radiational furnace on the basis of TG/DSC results and then re-anodized. There were nothing particular physical problems on the dielectric layer after pyrolysis. The condensers pyrolyzed between 240 and 260 ℃ recorded better properties like as a higher withstanding voltage and a lower leakage current. According to the impedance and SEM analysis results on the tantalum condenser pyrolytically decomposed 3 times with 30 wt% manganese nitrate aqueous solution, it was verified that uniform and stable manganese dioxide layers were formed by a dry-radiational pyrolysis and its properties like as capacitance, dissipation factor, internal resistance and frequency dependency were improved with the increase of the pyrolysis temperature.