Abstract: Inner Mongolia reaches of the Yellow River and its tributaries are rich in fish resources, which is an important part of fish resources in the Yellow Ri＇~er. After analysis and research of the fish fauna in the region, we found five families, three orders,ten subfamilies,twenty-five reaches attributed to 5 area respectively,The investigation showed that five kinds of fish can＇t be find related information in Inner Mongolia section of the Yellow River over the past years.