Abstract:Malignant obstructive jaundice (MOJ) refers to a group of diseases mainly caused by bilirubin, hyperbilirubinemia, yellow staining of tissues and fluids and bile duct dilatation caused by some malignant tumors. Because patients with MOJ often have malnutrition, nutritional support plays an important role in patients with MOJ. Fat emulsion can provide many essential fatty acids for the human body and is an important energy source for parenteral nutrition. Fatty acids also play an important role in the body. However, patients with MOJ often have metabolicdysfunction, which makes the fat emulsion difficult to tolerate in vivo.In recent years, the emergence of various types of fat emulsion makes the application of nutritional support in patients with MOJ have different ideas. This article reviews the role of fatty acids in the body, metabolism and the application of various fat emulsion and its advantages and disadvantages.