The determination of extreme limit of anti-lifting bearing capacity is an important content for pile’s anti-lifting research. When the load of anti-lifting pile does not reach the disrupt load, the forecast of extreme limit of anti-lifting pile’s bearing capacity by function model of extrapolation is significant in both theory and practice, according to the known load-displacement data. The extreme limit of anti-lifting bearing capacity was successfully forecasted out by hyperbola model, exponent model and power function model, using the imitation functions of curves of Grapher 4 and taking project cases as a base. The comparison of the results of three function models shown that the exponent model has higher forecast precision.