Abstract: Soil specimens were moulded according to different dry densities and then reinforced with 5% PS solutions. The specimens with or without PS reinforcement were subjected to disintegration test in water,to wind erosion test in wind tunnel,to temperature fluctuation test,to humidity variation test and to freezethaw test. So,the influences of serious environments of the ancient Silk Road on the reinforcement effect are studied. Specimens reinforced with 5% PS show a better resistance to environment weathering respectively. For example,they have a longer initial disintegration time,a slower disintegration speed,and a higher ability of antiwind erosion and freezethaw,as compared with unreinforced specimensThese results show that the PS reinforcement is still effective and the PS is suitable for conservation of the earthen ruins in arid area of the Silk Road．