Abstract: The enactment of the parameters of an ant system is determined by experience and experiment.This leads to heavy work load and makes the optimal combination of the parameters difficult to obtain.On the basis of the ant algorithm and the result of the experiment，the effect by changing the parameters of α、β、ρ is discussed，and an improved scheme is proposed.Then both of the improved scheme and the ant algorithm are applied to the function optimization problem，and a comparison is made in the simulation.