A preliminary engineering-geological study on the suspended river in the lower reaches of th Yellow River has been made from three systems, i. e. the earth's crust, foundation and embank ment. Through the study the authors have got systematic knowledge of suspened river, control ling factors of channel stability and geo-engineering regulation. Defining the aim of stabilizing pressent channels and taking the method of combining geo-engineering works with the water conservancy project are practicable approaches for eliminating the threat of the suspended river.