Intramuscular fat content( IMF) is one of the important factors affecting meat quality because it can influence meat tenderness and flavor and other physical and chemical properties. The article summarized the intramuscular fat deposition process including the fatty acid transport,Lipogenesis,and Lipolysis,and the expression levels of candidate genes of intramuscular fat deposition( the fatty acid binding protein( FABPs),fatty acid synthase( FAS),acetyl-coa carboxylase( ACC),hormone sensitive lipase( HSL),lipoprotein lipase( LPL)) in different breeds. All of these investigations will provide a reference for improving IMF content and future research progress.