The effects of different kinds of alcohol,different kinds and mass ratios of cationic/nonionic,as well as different kinds and mass ratios of nonionic/nonionic against the amount of solubilized water in the formation of diesel oil-water microemulsion were examined.The results show that n-pentanol is the optimal co-surfactant while any alcohol of longer or shorter chain are not preferential for the formation of microemulsion.The blend system D0821/AEO_3 has better solublization effect than D1221/AEO_3.Compari...