To observe and understand the morphology and structure of Acarophenax tribalii in order to create a new record of this mite in China.The stored grain samples (rice and brown rice) were collected from the storage of local dwellers, and mites breeding in the products were isolated. Then mite samples were prepared and identified as the previous protocols, and the species was classified in accordance with Hughes.A. tribalii was detected in the grain samples. The light microscopic examination exhibited ovally shaped idiosoma of this species, and the abdomen of the male was more inflated than that of the female. By general view, the propodosomatal plate appeared triangle-like, and its anterior margin was covered by the gnathosoma. Leg I consisted of four segments, and its tibia and tarsus healing were fused into a stubby tibiotarsus. A tarsulus occurred at the end of leg II, III and IV, with a claw born at each leg.The morphology and structure of A. tribalii are characterized. This may lay a basis for following study on this species.