2, the mouth, from the side of the carp's mouth in the side of the center line of the lower position, the grass carp's mouth in the side of the center line of the center. The carp's kiss is wider and thicker, and those who have observed it carefully can find that carp often like to arch the pond mud with their kisses, and their lips shrink and shrink, and the grass carp's kiss is shorter and smaller.

3, body color, general carp body color to gray-black as the tone, and add a golden yellow, orange and other colors; grass carp is generally gray-black, carp tail fins and even anal fins often have a reddish color, while the grass carp general fins are gray-black, no other colors.

4, fins, carp dorsal fin base is generally longer in long band, grass carp dorsal fin is shorter, carp dorsal and anal fins are generally have a hard spine.

5, body type, carp body on the upper side of the flatter, blunt round abdomen; grass carp is a tube type, or others often say pike type, pike type, like a rugby ball, as for the carp side of the flatter in the middle of the thick.