Ant colony algorithm has slow convergence rate,low efficiency and often gets local optimal solution.We propose an adaptive way to change the amount of pheromones,which can speed up the convergence rate.We also improve the heuristic function to increase the purpose of ant colony search,as well as reduce the probability of falling into local optimal solution.Simulations are carried out to verify the effectiveness of the proposed algorithm,and the results show that the global optimal search ability and convergence rate are greatly improved.