Considering the interaction between basement rock and pile, a procedure for computing uplift capacity of uplift pile with constant section is deduced according to power function slip surface premise and based on limit equilibrium method. Based on the report of skin friction experiment of pile in soft rock, it is taken that the power function slip surface of pile is close to experiment when the coefficient N = 0. Meanwlile the comparison between theoretical predictions and experimental data indicates the accuracy of the computing formula. According to this computing formula, it is proposed that the coefficient of interaction between soft rock and pile should take 0.7-0.8 discount of coefficient of rock’s internal friction angle and cohesion c. The relation between the internal friction angle , cohesion c and uplift capacity of short uplift pile in soft rock is revealed, where the uplift capacity is enhanced with increasing of the internal friction angle ?, cohesion c of soft rock and cohesion c is more efficient.