Abstract: The present invention relates to a low-calorie/low-fat dressing and mayonnaise formulation for which the emulsifying stability has been improved using fibrous fiber. More specifically, it relates to a low-calorie/low-fat dressing and mayonnaise formulation wherein the dietary fiber content and emulsifying stability are improved by carrying out a high-temperature heat treatment together with ultrasonication during the cross-linking of starch, and fibrous fiber with reduced starch particle size is added to lower the fat content and improve the emulsifying stability.