Abstract: There are many ruins of ancient earthen sites in Northwest China, which are precious mankinds culturalheritage, and their valuable artistic value is rareworldwide. But the violent processes of the wind erosion caused many ancient earthen sites collapsed. Many investigation indicate that the wind erosion is the main power mechanism and the genesis resulting in destruction of the ancinet earthen ruins. So this paper make the indoor wind-tunnel test and field wind erosion test to study the performance against wind erosion. The experimental result conclude that the bear for wind erosion of the consolidated ancient earthen sites are hugely increased.. The results of the indoor wind-tunnel test indicate that the wind erosion amount is increased with wind speed and with test time. At the same time, the laboratory experiment discovered that even if the wind speed reaches 20 m/ s, the wind erosion amount of the samples reinforced with more than 5 % of PS is less than 20 (kg/m2•h), and the against wind erosion intensity enhances 6~10 times. According to the result of the field wind erosion test, the wall consolidated with 3 % or 5 % of PS is good bear for wind erosion, and the depth of penetration and the amount of PS material directly affect reinforcingt effect. In sum, the key to protecing Ruins is to choosing the suitable consistence PS material and is to enhancing penetrability of PS material So this reinforced method could be effective in scientific protecting the rare ancient earthen sites from rigorous natural conditions in Northwest China.

Key words: The ancient sites, wind erosion, PS material, protection