Dorsal fin IX-16; Gluteal fin15 ~16; Pectoral fin11+iii; 0+III； Abdominal fin I-5; Scale type 127~ 132. The body is slender and slightly flat. The first dorsal fin is the highest in front of it and gradually tapers backwards. Body length is 4.6~4.7 times of body height and 2.9~3.8 times of head length. Big head, nearly rectangular, narrow back; The back and sides are covered with bone plates, and the head length is 2. 1~2.6 times that of the snout. The snout is long, the back is convex, and the front center is slightly concave; The nose and mouth are wide and round, with several short tips. Big eyes, in the upper position, with 2 short thorns in the front upper corner; The distance between the eyes is wide and slightly concave. 2 nostrils, the front nostrils are small and round; The posterior nostril is slit-shaped, which is about equal to the diameter of the eye. The mouth is large, the end position is long, and the posterior end of the maxilla extends below the anterior edge. The maxilla, mandible and vomer have villous teeth, while the palatine bone has no teeth. There is a dent in the center of the maxilla and no teeth. Tongue is wide, round and not free. There are two spines in the lower corner of the anterior branchial lid, and there are two small protrusions in the branchial lid. The cervical vertebra is flat and triangular, and does not reach the vertical line from the starting point of the first dorsal fin; The scapula is large and blunt. The branchial foramen is large, connected with the branchial lid, spanning the isthmus and extending forward to the lower part of the anterior nostril. Gill cover strip 7. Gill harrow is short, 8~9. With fake cheeks. The scales are small and round, with scales above the lateral line of 127~ 132, scales above the lateral line of 14~ 15 and scales below the lateral line of 53~57. There is no scale on the head, chest and abdomen. There are 9 pairs of ratchet plates at the base of the first dorsal fin; There are 15 pairs of ratchet plates at the base of the second dorsal fin. 2 dorsal fin; The first dorsal fin begins above the base of pectoral fin, and has 9 fin spines, with the first and third fin spines being the longest. The second dorsal fin is long, 16 fin. The anal fin is long, the spines without fins are opposite to the second dorsal fin, and the fin 15~ 16. The pectoral fin is wide and round, with the rear end reaching above the eighth fin of the gluteal fin and the three-finger free fin below. The ventral fin is located in the chest, with 1 fin spine and 5 fins extending to the anus. The caudal fin is truncated or shallowly concave. The body cavity is large and the peritoneum is colorless. The stomach is cystic, thick-walled, coiled twice, and the intestine is longer than the body length. Finger pyloric caecum 9. The swim bladder is developed. The back surface is red, the belly surface is white, and there are blue-brown reticular markings on the head and back surface. The anterior ventral surface of pectoral fin is gray-blue, while the dorsal surface is blue-black, with pink-green spots. There is a black spot on the back of the first dorsal fin near the base; The second dorsal fin has two rows of longitudinal black spots; The remaining fins are grayish red.