Abstract: Based on summing up earth pressure calculating formulas in the deep and thick soils,the properties of earth pressure are presented according to the construction process of freezing engineering. In addition,the relations between extrusion (relaxation) displacement and extrusion (relaxation) stress P_s are obtained from horizontal loading (unloading) tests of remodeled deep soils experienced high pressure K_o consolidation and the calculating errors of earth pressure as well as thickness of frozen wall caused by neglecting P_s, are investigated too. The results indicate that earth pressure in deep and thick soils should be selected in accordance with the construction process of freezing engineering in order to avoid project accident.