Abstract：It is a universal matter that the earthen architectures were eroded and deflated seriously under the specific climate in arid areas. It is fairly necessary to study the reinforcement of earth-structure sites. So，more attentions are paid to consolidate the earthen architecture using chemical techniques instead of traditional ones all over the world. Potassium silicate(PS) is an inorganic cementing-consolidating material of aqueous solution. It plays an effective role in protecting the earthen architecture sites from weathering in arid region. 20 years¢ experimental researches and applications have proved that the effects of modulus and concentration of PS material on consolidation are noticeable. Experimental analysis indicates that the strength of consolidated soil by PS material has been improved generally. Both its strength and capability to prevent the erosion of wind and rain have been enhanced with the increase of concentration，while they reduce with the increase of modulus. In addition，the resistance of the consolidated soil to freeze-thaw has been improved，so it¢s helpful to preserve the earthen architecture in the arid-cold region. Meanwhile，the modulus and concentration have remarkable influence on its freeze-thaw resistance. It is the best for the concentration with 5% and the consolidated soil modulus with 3.84 to prevent freeze-thaw. The slight changes in density and porosity demonstrate that the consolidated soil still retains good gas permeability and water one. Based on the comprehensive consideration，the consolidation with concentration 5% and modulus 3.84 is optimal. On the basis of research and practice，it could be considered that the PS is an effective material for reinforcement of earthen architecture sites in Northwest China and has an ideal effectiveness.
