Terrance in Jinyun Mt., argillutite combination, thick sandstone in upper level, argillutite in lower level, hydrocele in argillutite, thick terrene and more seeper. In contact surface of sandstone and argillutite, there is contact water. After mining, coal hole in coal mine. Under long-period action of these flow water in rocks, coteau is formed by topographical crest. There are many adjusted streams and gully in parallel arrangement to form comb-type water system in Jinyun Mt.