The elastic membrane generated from the reaction between polyurethane stabilizer and water can effectively improve the strength of sand. In order to study the effect of temperature on the improvement of polyurethane stabilizer,unconfined compression test was carried out. The variation of sand strength with different density and polyurethane stabilizer content at different temperatures was analyzed and the influence mechanism of temperature is analyzed in depth. The test results show that temperature has obvious influence on the improvement of polyurethane stabilizer and the unconfined compressive strength increases with the increase of density and polyurethane stabilizer content at constant temperature. When the temperature is higher (≥ 35℃),soil moisture decreases and the cured film shrinks causing the increase of its elasticity and strength,which can greatly improve the the strength of sand. When the temperature is lower (≤ 10℃),the cured film is frozen and the strength increases,which can further improve the strength of the sand;Under two extreme temperature conditions,the effect of polyurethane stabilizer is improved,but the effect is more obvious at high temperature.