Through testing the creep characteristics of plastic geogrid under the temperature of 20 degrees C, 10 degrees C, 0 degrees C and -20 degrees C, we obtained the creep characteristics curve under the different temperature. In order to obtioning the creep regulations of plastic geogrid by freezing and thawing cycle, we made the plastic geogrid for 10 times freezing and thawing cycle at -20 degrees C - 20 degrees C, the one which was tested under the temperature of 20 degrees C until its deformation became stable. Conclusions: (1) The creep of the plastic geogrid under different temperatures is quite different, it is greatly influenced by temperature and the lower the temperature the smaller the creep value; freezing and thawing cycle have influence in creep characteristics, In the condition of freezing and thawing cycle,while the creep value get stable at the normal temperature, the creep value also increasing with the temperature getting high and decreasing with temperature getting low; (2) According to the creep regulations under low temperature and freezing and thawing cycle condition,we advance the counting method of impact factor of freezing and thawing cycle, DR and creep impact factor of low temperature FOR.
