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In this paper,soybean protein hydrolysate(SPH)and lecithin were studied as the starting subjectUsing Protex6L to hydrolyze soy protein,the emulsions were then prepared with SPH and lecithin.The emulsifying activity and stability,interface protein content,ζ-potential value, average droplet diameter(D43)and optical microscope analysis were conducted.The results showed that the emulsions prepared with SPH and lecithin exhibitedsignificantly improved emulsifying activity and stability.