Abstract:Docose Hexaenoie Acid（DHA）can improve ability of memory and thinking. But it was highly unsat－ urated， easy to corrupt and poor stability， so microencapsulation was the best way to preserve DHA by spray drying， at present. It was necessary to prepare DHA emulsion with high stability and high embedding rate，in or－ der to obtain high quality microcapsules of algal oil DHA. The related experiments was carried out. The results showed that the optimized process conditions were soy protein isolate and maltodextrin as the composite wall ma－ terial， sucrose fatty acid ester and monostearate glycerol（quality ratio of 7 ∶ 3） as emulsifier， emulsifier content 2 %，emulsification time 7 minutes， emulsification temperature 85 ℃.Under this condition， the emulsion stabil－ ity of DHA microcapsule was kept above 95.6 %.