The local health bureaus in Central Taiwan area launched their Joint Detection System in February, 2006, which includes laboratories of Changhua County, Taichung County, Taichung City, Nantao County and Miaoli County as the members of the system. Laboratory of the Chuanghua Health Bureau was in charge of analysis saccharin, cyclamate, sulfur dioxide and bactericide. From February to December, 2006, 1559 food samples were analyzed for contents of the abovementioned additives, including 231 samples for saccharin and 0.9% tested positive, 195 samples for cyclamate and 16.9% positive, 377 samples for bleaching agents sulfur dioxide and 15.1% positive, 756 samples for bactericide H2O2 and 5.6% positive.