Abstract: Intramuscular fat（IMF）, commonly known as “marbling”, is an important componet of pork adipose tissue, and can improve the tenderness, juiciness and flavor of meat, and is an important index for evaluating meat quality. IMF is mainly distributed in muscle fibers or muscle fiber bundles, and is composed of triglycerides, phospholipids and cholesterol. It is affected by genetics, nutrition, environment and other factors. In this paper, the main factors affecting IMF deposition in pigs and the role of non-coding RNA（ncRNA, including small RNAmiRNA, long non-coding RNAlncRNA,and circular RNAcircRNA） in IMF deposition in pigs were reviewed, in order to provide a theoretical basis for further study of the molecular mechanism of porcine fat deposition.