Crab yolk is crab eggs, there are two kinds of river crab yolk and sea crab yolk, river crab yolk is good, sea crab yolk flavor is slightly worse. Crab yolk contains a lot of essential protein, fat, phospholipids, vitamins and other nutrients, nutritious. However, the content of cholesterol in crab yolk is very high, and the content of cholesterol per 100g crab brain can be as high as 466mg. Therefore, patients with coronary heart disease, hypertension, arteriosclerosis, and hyperlipidemia should eat less or not eat crab yolk. General nutrition experts believe that sea crabs and river crabs are very rich in nutritional value, in general belong to the cool food, there is no big difference. Chinese medicine experts believe that river crabs are cool, sea crabs are slightly milder, so the medicinal use of freshwater crabs is good. Recently, some crab experts have analyzed river crabs and sea crabs in more detail. Comparison found that the river crab meat calories (103.00 kcal) to be higher than the sea crab meat calories (95.00 kcal), the rest of the meat on the nutritional value of the difference is not great, the only difference is the crab yolk and crab paste. The only difference is the crab yolk and crab paste. In terms of crab yolk, the female river crab yolk is better, and the nutritional value of sea crab yolk is a little inferior. In terms of crab paste, there is no difference between river crabs and sea crabs, and only male crabs have crab paste. It is concluded that the female river crab has the highest nutritional value, followed by the male river crab. If it is a comparison between river crabs, then the nutritional value of male and female crabs is higher than that of female crabs. If it is a comparison between sea crabs, then the nutritional value of male and female crabs, the value of male crabs is higher.