Abstract:Emulsions were used as a delivery system for active ingredients due to their unique delivery properties.Because of its multilayer structure，multilayer emulsion forms a thick interface layer，which increases the capacity of the delivery carrier against external pressure，prolongs the time of lipid digestion，and thus protects the active ingredients.It can also slowly release the active ingredients through reasonable design of the interface layer.In this paper，the construction principle of multilayer emulsion，the characteristics of the interface layer and the factors influencing the stability of the interface layer were introduced in detail，and the application progress of multilayer emulsion in food and related industries in recent years was also reviewed.This paper was expected to provide new ideas for the delivery of active ingredients.