60%以上。The technology of emulsifying bio-oil with diesel by nonionic surfactants was researched. The nonionic surfactant was evaluated. Emulsion stability was selected as the target, and the effect of HLB value, emulsifying temperature, emulsifying time on the emulsion stability was investigated. Experimental results indicated that the stable emulsions of water in oil came into being by 2 percent nonionic surfactants combined by Span 80 and Tween 80 with the help of 0.1 percent 1-octanol at 30～50℃ the stability time of emulsion lasted for 60h; the microscopical photo of emulsion involving 5 percent bio-oil shows that the bio-oil drops whose diameters between 5 and 15μm accounted for more than 60 percent. 