Abstract：Foundation treatment method，treatment thickness and residual collapse settlement of collapse loess with large thickness are hot issues in engineering design in loess areas. Based on the collapse characteristics of collapse loess with large thickness，research work in three aspects related to collapse loess was conducted. Firstly，the principles of foundation treatment for collapse loess under overburden pressure with large thickness were expounded. Secondly，combining various sorts of buildings，the controlling standard of foundation treatment thickness and the residual collapse settlement were suggested. Thirdly，the applicabilities for whole treatment，local treatment of foundation and multiple treatment methods were discussed；and some successful examples for various treatment methods were introduced.
