Abstract：To study the engineering effect and applicable condition of geocell and coarse particle，a kind of flexible structure，which was used for embankment slope surface protection in permafrost regions on Qinghai—Tibet plateau，experimental project，and embankment slope surface protection with geocell，was designed and carried out in Tuotuo River regions along Qinghai—Tibet Railway. The experiments included determination of physico- mechanical index of geocell filling and testing geocell mechanical characteristics under various conditions，such as under normal temperature(20 ℃)，high temperature(60 ℃)，low temperature(－25 ℃)，cyclic condition(low temperature→high temperature→low temperature)，continuous low temperature and normal temperature cyclic condition and ultraviolet radiation condition. In the meantime，freezing and thawing characteristics and aging resistance of geocell were tested. Also，the embankment surface deformation is measured. The indoors and field test results showed that the geocell material had the characteristics of cold and aging-resistance. The geocell material could be used for embankment slope surface protection in permafrost regions. Moreover，based on the achievements of experiments，the main points for embankment slope surface protection with geocell disposal measure applied in permafrost regions on plateau were put forward.
