Based on the analysis to existing methods of mathematical model prediction and optimized analysis to exponential curve model with certain modified method, we put forward a new modified exponential curve model.The correlativity coefficient of this modified exponential curve model is over 0.996 according to the fitting analysis of actual measurement data of static load test of different types of single piles, and the fitting effect by the model is better than that by hyperbolic model and integrated exponential curve model. The modified exponential curve model can describe P-s curves of single piles well, and it can be used to forecast the ultimate beating capacity of single piles.