The loose grain structure of the ground is easy to produce pile formation and other quality problems, and also has a great influence on the bearing performance of pile foundation. Based on the project of Futai Home in Zigong City, the static load test of pile foundation was carried out for two test piles on site, and the bearing capacity of pile foundation in strata was studied by theoretical analysis. The results show that the load-settlement curves of the two piles are of steep drop type, and the pile ends and pile sides share part of the load respectively. The ultimate bearing capacity value of pile is close to the design value, and the redundancy is not conducive to the structural safety, so it can be considered to solidify the sand stratum or increase the pile length. A simplified load-displacement transfer model of pile foundation composed of double-fold line model on pile side and double-parameter exponential model on pile end is proposed. The load-settlement curve is obtained by iterative algorithm programmed by MATLAB. It is found that the theoretical calculated value is in good agreement with the experimental value, indicating that this load-displacement model is reasonable and feasible which can provides a reference for the research of bearing capacity of pile foundation in similar sand stratum.