Abstract: The importance and present conditions of coal water mixture are introduced,and coal water mixture preparation technology is explained,then it focuses on analysis of this technology by flotation concentrate. Based on subaeration flotation machine features and its application in CWM preparation plant of ziqiang industry and trade company of Shandong,the subaeration flotation machine has remarkable advantage in the process of preparing coal water mixture by flotation concentrate,which can provide reference for application of this equipment in slime CWM preparation industry.