Abstract: The non self-weight collapsible loess in Anyang region belong to the forepart and recent sediment of Quaternary Holocene epoch. In this region, the collapsible loess have similar physical behavior but the mechanical property is significant different. After introduce the traditional reinforcement method used for many years, this paper focus on the reinforcement mechanism of the cement fly-ash slag pile and the state of stress as well as the reinforcement effect of the compound foundation.