Abstract: The model test material of collapsible loess is the bottleneck of similar material model research in geomechanics, which has limited application of model tests in loess area. A similar material of model test for collapsible loess is developed by airfall technique based on Monte Carlo method. A single pile foundation model test is carried out to investigate the negative skin friction of the pile under the effect of self-weight collapsibility. The research results show that the axial force along the pile of different time roughly appeared as the shape of B.The neutral point is located between the modeled collapsible soil and sands. The settlement of the top of pile is far less than collapse deformation of the soil due to the effect of self-weight collapsibility. The negative frictional resistance of the pile increases along the depth and reaches the peak at the neutral point. The frictional resistance along the pile roughly appears as the shape of Dwhen immersing water for 1 hour. Through out the testing phase, the negative friction reaches a second peak and the curve distributes as the shape of . The settlement of the top of pile is about 0.54mm due to the frictional resistance. The experimental research methods and results can provide references for similar projects.