Nowadays, environmental problem becomes more importnnt nnd many countries are interested in treating wastes. Many resenrches are studied environmentnl and economic trentment of wnstes according to need. Handling sewnge sludge which is disposed in ocenn is nlso come into the spotlight. There are many methods for handling sewage sludge except ocenn disposnl but this paper was studied about effective combustion as fuel for conl-fired power plant. The amount of sewnge sludge is very small instead of coal. So sewage sludge must be combust with coal. Therefore This study estimated combustion characters and pyrolysis behavior for sewage sludge-coal mixture using TG in order to satisfy fuel condition in power plant.