With a warming climate, cold regions ecosystems undergo significant ecological changes such as encroachment of canopy-forming shrubs into tundra communities (termed as shrubification) using repeat photography, long-term ecological monitoring and dendrochronology over past decades. Recent researches have documented that shrub expansion around the cold regions influence the local scale hydrological cycle. shrubification is becoming the important parts, and aroused general interest in cold region hydrological research. However, the effects of this process on freeze-thaw processes and water and heat processes of frozen soil still are unclear. Therefore, we will select the Hulu watershed in Qilian Alpine Ecology and Hydrology Research Station of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences as experimental area. Based on Open-top chamber stimulated warming method, this program will take Potentilla fruticosa as test object to detect effects of warming and Shrubification on freeze-thaw processes and water and heat processes of frozen soil under shrub cover in Qilian Mountains. The differences of water and heat balance and transfer processes between simulated warming and shrub cover will be analyzed by using experimental data. Then, the CoupModel model will be used to simulate the gradients and transfer characteristic of water and heat in frozen soil under different shrub cover and warming scenarios. Analysis of the impact of shrub cover on pattern and process of water and heat transfer under warming scenarios also will be documented. Finally, we will make a preliminary quantitative assessment for difference of impacts of Shrubification and warming on water and heat transfer processes of frozen soil, and forecast the response of frozen soil water and heat transfer process of frozen soil to the Shrubification process under warming scenarios. The results will provide important parameters and theoretical foundation for large scale hydrological research in cold regions, land surface processes and model research, and global climate change research.