The aim of the research is to find out effect of platic addition to the combustion characteristic of municipal solid waste (MSW) briquette as an alternative solid fuel. The briquette consist of the oeganic MSW crushed into litle pieces and mixed with the plastic componen which plastic percentage are the variable of this research (0%, 5%, 10% and 20% weight based)., limestone and mollases as the binder and pressed in pressing machine. The plastic precentages are the variable of this research. The briquette were taken into furnace to find the combustion characteristics. The results of the research show that that the addition of plastic component naturaly rise the combustion temperature but also lower CO emision, beside the this research shows that 10% plastic addition give the optimum combustion characteristic